The Collaborative International Dictionary of English v.0.48:

Blare \Blare\, v. i. [imp. & p. p. Blared; p. pr. & vb. n.
   Blaring.] [OE. blaren, bloren, to cry, woop; cf. G.
   pl[aum]rren to bleat, D. blaren to bleat, cry, weep. Prob. an
   imitative word, but cf. also E. blast. Cf. Blore.]
   To sound loudly and somewhat harshly. "The trumpet blared."
   --Tennyson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blare \Blare\, v. t.
   To cause to sound like the blare of a trumpet; to proclaim
   loudly.
   [1913 Webster]

         To blare its own interpretation.         --Tennyson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blare \Blare\, n.
   The harsh noise of a trumpet; a loud and somewhat harsh
   noise, like the blast of a trumpet; a roar or bellowing.
   [1913 Webster]

         With blare of bugle, clamor of men.      --Tennyson.
   [1913 Webster]

         His ears are stunned with the thunder's blare. --J. R.
                                                  Drake.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blare
    n 1: a loud harsh or strident noise [syn: blare, blaring,
         cacophony, clamor, din]
    v 1: make a strident sound; "She tended to blast when speaking
         into a microphone" [syn: blast, blare]
    2: make a loud noise; "The horns of the taxis blared" [syn:
       honk, blare, beep, claxon, toot]

Moby Thesaurus II by Grady Ward, 1.0:

181 Moby Thesaurus words for "blare":
   bark, bawl, bay, beep, belch, bell, bellow, blare forth, blast,
   blat, blate, blaze, blaze abroad, blazing light, blazon,
   blazon about, bleat, blinding light, blow, blow the horn, blubber,
   boom, bray, breathe, bright light, brightness, brilliance,
   brilliancy, brilliant light, bugle, burr, burst of light, buzz,
   cackle, call, caterwaul, caw, celebrate, chant, chirp, chirr,
   clamor, clang, clangor, clank, clarion, clash, coo, craunch, croak,
   crow, crump, crunch, cry, cry out, dazzling light, declaim, drawl,
   echo, effulgence, exclaim, fanfare, flamboyance, flame, flare,
   flood of light, flourish of trumpets, flute, fulgor, gasp,
   give tongue, give voice, glare, glaring light, glory, glow, grind,
   groan, growl, grumble, grunt, herald, herald abroad, hiss, honk,
   howl, jangle, jar, keen, lilt, low, meow, mew, mewl, miaow, moo,
   mumble, murmur, mutter, neigh, nicker, noise, pant, peal, pipe,
   proclaim, promulgate, pule, radiance, radiancy, radiant splendor,
   rasp, refulgence, refulgency, resonate, resound, resplendence,
   resplendency, reverberate, ring, roar, rumble, scranch, scrape,
   scratch, screak, scream, screech, scrunch, shout, shriek, sibilate,
   sigh, sing, snap, snarl, snore, snort, sob, sound, sound a tattoo,
   sound taps, splendor, squall, squawk, squeak, squeal,
   streaming light, tantara, tantarara, taps, tarantara, tattoo,
   thunder, thunder forth, toot, tootle, troat, trumpet,
   trumpet blast, trumpet call, trumpet forth, twang, tweedle,
   ululate, vividness, wail, warble, whicker, whine, whinny, whisper,
   whistle, wind, yap, yawl, yawp, yell, yelp, yip, yowl