The Collaborative International Dictionary of English v.0.48:

Breathe \Breathe\, v. t.
   1. To inhale and exhale in the process of respiration; to
      respire.
      [1913 Webster]

            To view the light of heaven, and breathe the vital
            air.                                  --Dryden.
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   2. To inject by breathing; to infuse; -- with into.
      [1913 Webster]

            Able to breathe life into a stone.    --Shak.
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            And the Lord God formed man of the dust of the
            ground, and breathed into his nostrils the breath of
            life.                                 --Gen. ii. 7.
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   3. To emit or utter by the breath; to utter softly; to
      whisper; as, to breathe a vow.
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            He softly breathed thy name.          --Dryden.
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            Or let the church, our mother, breathe her curse,
            A mother's curse, on her revolting son. --Shak.
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   4. To exhale; to emit, as breath; as, the flowers breathe
      odors or perfumes.
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   5. To express; to manifest; to give forth.
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            Others articles breathe the same severe spirit.
                                                  --Milner.
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   6. To act upon by the breath; to cause to sound by breathing.
      "They breathe the flute." --Prior.
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   7. To promote free respiration in; to exercise.
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            And every man should beat thee. I think thou wast
            created for men to breathe themselves upon thee.
                                                  --Shak.
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   8. To suffer to take breath, or recover the natural
      breathing; to rest; as, to breathe a horse.
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            A moment breathed his panting steed.  --Sir W.
                                                  Scott.
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   9. To put out of breath; to exhaust.
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            Mr. Tulkinghorn arrives in his turret room, a little
            breathed by the journey up.           --Dickens.
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   10. (Phonetics) To utter without vocality, as the nonvocal
       consonants.
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             The same sound may be pronounces either breathed,
             voiced, or whispered.                --H. Sweet.
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             Breathed elements, being already voiceless, remain
             unchanged

   Note: [in whispering].                         --H. Sweet.
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   To breathe again, to take breath; to feel a sense of
      relief, as from danger, responsibility, or press of
      business.

   To breathe one's last, to die; to expire.

   To breathe a vein, to open a vein; to let blood. --Dryden.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Breathe \Breathe\ (br[=e][th]), v. i. [imp. & p. p. Breathed
   (br[=e][th]d); p. pr. & vb. n. Breathing.] [From Breath.]
   [1913 Webster]
   1. To respire; to inhale and exhale air; hence;, to live. "I
      am in health, I breathe." --Shak.
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            Breathes there a man with soul so dead
            Who never to himself hath said,
            This is my own, my native land!       --Sir W. Scott
                                                  [The Lay of
                                                  the Last
                                                  Minstrel].
      [1913 Webster +PJC]

   2. To take breath; to rest from action.
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            Well! breathe awhile, and then to it again! --Shak.
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   3. To pass like breath; noiselessly or gently; to exhale; to
      emanate; to blow gently.
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            The air breathes upon us here most sweetly. --Shak.
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            There breathes a living fragrance from the shore.
                                                  --Byron.
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WordNet (r) 3.0 (2006):

breathe
    v 1: draw air into, and expel out of, the lungs; "I can breathe
         better when the air is clean"; "The patient is respiring"
         [syn: breathe, take a breath, respire, suspire]
    2: be alive; "Every creature that breathes"
    3: impart as if by breathing; "He breathed new life into the old
       house"
    4: allow the passage of air through; "Our new synthetic fabric
       breathes and is perfect for summer wear"
    5: utter or tell; "not breathe a word"
    6: manifest or evince; "She breathes the Christian spirit"
    7: take a short break from one's activities in order to relax
       [syn: rest, breathe, catch one's breath, take a
       breather]
    8: reach full flavor by absorbing air and being let to stand
       after having been uncorked; "This rare Bordeaux must be
       allowed to breathe for at least 2 hours"
    9: expel (gases or odors) [syn: emit, breathe, pass off]

Moby Thesaurus II by Grady Ward, 1.0:

309 Moby Thesaurus words for "breathe":
   He, affect, air, alert, approve, argue, articulate, aspirate,
   attest, bark, bawl, be, be alive, be animate, be aromatic,
   be construed as, be extant, be found, be in existence, be met with,
   be present, be redolent of, be the case, be there, bellow, bespeak,
   besprinkle, betoken, blare, blat, blow, blubber, boom, brandish,
   bray, break, break it to, break the news, breathe hard, breathe in,
   breathe out, brew, bring forth, bring forward, bring into view,
   bring out, bring to notice, buzz, cackle, chant, chime, chirp,
   chorus, color, come out with, communicate, confide, confide to,
   connote, convey, coo, cough, crow, dangle, decoct, deliver,
   demonstrate, denote, develop, disclose, display, divulgate,
   divulge, dramatize, draw breath, draw in, drawl, dredge, dye,
   embody, emit, emit a smell, enact, entincture,
   entrust with information, enunciate, evidence, evince, evulgate,
   exclaim, exhale, exhaust, exhibit, exist, expel, expire,
   expose to view, express, fetch breath, flaunt, flavor, fling off,
   flourish, flute, formulate, furnish evidence, gasp, give,
   give confidential information, give expression, give indication of,
   give out, give out with, give sign, give token, give tongue,
   give utterance, give vent to, give voice, go to show, growl, grunt,
   gulp, hack, happen to be, have being, have life, have place,
   hiccup, highlight, hint at, hiss, hold, huff, illuminate,
   illustrate, imbrue, imbue, impart, imply, import, impregnate,
   incarnate, indicate, infiltrate, infuse, inhale, inspire, instill,
   involve, keen, knock off, lay off, leaven, let get around,
   let in on, let next to, let out, lie by, lilt, lip, live,
   live and breathe, maffle, make clear, make known, make plain,
   manifest, mark, materialize, mean, mention privately, move, mumble,
   murmur, mussitate, mutter, nose, obtain, occur, out with, pant,
   parade, pause, penetrate, perform, permeate, pervade, phonate,
   phrase, pipe, point to, pour forth, present, prevail, produce,
   pronounce, publish, puff, put forth, put hep, put in words,
   put next to, raise, recess, reek, refer to, represent, respire,
   reveal, roar, roll out, rumble, saturate, say, scent, scream,
   screech, season, set forth, show, show forth, show signs of,
   shriek, sibilate, sigh, signalize, signify, sing, slurp, smell,
   smell of, snap, snarl, sneeze, sniff, sniffle, snore, snort, snuff,
   snuff in, snuffle, sob, sound, speak, speak for itself,
   speak volumes, spell, spotlight, squall, squawk, squeal, stand,
   stand for, steep, stink, stop for breath, subsist, suck, suck in,
   suckle, suffuse, suggest, susurrate, symbolize, symptomatize,
   take a break, take a recess, take a rest, take aside, take five,
   take ten, take time out, tell, tell confidentially, temper,
   tend to show, throw off, thunder, tincture, tinge, tip, tip off,
   token, transfuse, trot out, trumpet, twang, unfold, utter, vent,
   ventilate, verbalize, vocalize, voice, wail, walk the earth,
   warble, wave, wheeze, whiff, whine, whisper, word, yap, yawp, yell,
   yelp, yield an odor