The Collaborative International Dictionary of English v.0.48:

Suffer \Suf"fer\, v. i.
   1. To feel or undergo pain of body or mind; to bear what is
      inconvenient; as, we suffer from pain, sickness, or
      sorrow; we suffer with anxiety.
      [1913 Webster]

            O well for him whose will is strong!
            He suffers, but he will not suffer long. --Tennyson.
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   2. To undergo punishment; specifically, to undergo the
      penalty of death.
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            The father was first condemned to suffer upon a day
            appointed, and the son afterwards the day following.
                                                  --Clarendon.
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   3. To be injured; to sustain loss or damage.
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            Public business suffers by private infirmities.
                                                  --Sir W.
                                                  Temple.
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The Collaborative International Dictionary of English v.0.48:

Suffer \Suf"fer\, v. t. [imp. & p. p. Suffered; p. pr. & vb.
   n. Suffering.] [OE. suffren, soffren, OF. sufrir, sofrir,
   F. souffrir, (assumed) LL. sofferire, for L. sufferre; sub
   under + ferre to bear, akin to E. bear. See Bear to
   support.]
   1. To feel, or endure, with pain, annoyance, etc.; to submit
      to with distress or grief; to undergo; as, to suffer pain
      of body, or grief of mind.
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   2. To endure or undergo without sinking; to support; to
      sustain; to bear up under.
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            Our spirit and strength entire,
            Strongly to suffer and support our pains. --Milton.
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   3. To undergo; to be affected by; to sustain; to experience;
      as, most substances suffer a change when long exposed to
      air and moisture; to suffer loss or damage.
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            If your more ponderous and settled project
            May suffer alteration.                --Shak.
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   4. To allow; to permit; not to forbid or hinder; to tolerate.
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            Thou shalt in any wise rebuke thy neighbour, and not
            suffer sin upon him.                  --Lev. xix.
                                                  17.
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            I suffer them to enter and possess.   --Milton.
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   Syn: To permit; bear; endure; support; sustain; allow; admit;
        tolerate. See Permit.
        [1913 Webster]

WordNet (r) 3.0 (2006):

suffer
    v 1: undergo or be subjected to; "He suffered the penalty";
         "Many saints suffered martyrdom" [syn: suffer, endure]
         [ant: enjoy]
    2: undergo (as of injuries and illnesses); "She suffered a
       fracture in the accident"; "He had an insulin shock after
       eating three candy bars"; "She got a bruise on her leg"; "He
       got his arm broken in the scuffle" [syn: suffer, sustain,
       have, get]
    3: experience (emotional) pain; "Every time her husband gets
       drunk, she suffers"
    4: put up with something or somebody unpleasant; "I cannot bear
       his constant criticism"; "The new secretary had to endure a
       lot of unprofessional remarks"; "he learned to tolerate the
       heat"; "She stuck out two years in a miserable marriage"
       [syn: digest, endure, stick out, stomach, bear,
       stand, tolerate, support, brook, abide, suffer,
       put up]
    5: get worse; "His grades suffered"
    6: feel pain or be in pain [syn: suffer, hurt] [ant: be
       well]
    7: feel physical pain; "Were you hurting after the accident?"
       [syn: hurt, ache, suffer]
    8: feel unwell or uncomfortable; "She is suffering from the hot
       weather"
    9: be given to; "She suffers from a tendency to talk too much"
    10: undergo or suffer; "meet a violent death"; "suffer a
        terrible fate" [syn: suffer, meet]
    11: be set at a disadvantage; "This author really suffers in
        translation" [syn: suffer, lose]