The Collaborative International Dictionary of English v.0.48:

Grudge \Grudge\, v. i.
   1. To be covetous or envious; to show discontent; to murmur;
      to complain; to repine; to be unwilling or reluctant.
      [1913 Webster]

            Grudge not one against another.       --James v. 9.
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            He eats his meat without grudging.    --Shak.
      [1913 Webster]

   2. To feel compunction or grief. [Obs.] --Bp. Fisher.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grudge \Grudge\ (gr[u^]j), v. t. [imp. & p. p. Grudger; p. pr.
   & vb. n. Grudging.] [OE. grutchen, gruchen, grochen, to
   murmur, grumble, OF. grochier, grouchier, grocier, groucier;
   cf. Icel. krytja to murmur, krutr a murmur, or E. grunt.]
   1. To look upon with desire to possess or to appropriate; to
      envy (one) the possession of; to begrudge; to covet; to
      give with reluctance; to desire to get back again; --
      followed by the direct object only, or by both the direct
      and indirect objects.
      [1913 Webster]

            Tis not in thee To grudge my pleasures, to cut off
            my train.                             --Shak.
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            I have often heard the Presbyterians say, they did
            not grudge us our employments.        --Swift.
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            They have grudged us contribution.    --Shak.
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   2. To hold or harbor with malicious disposition or purpose;
      to cherish enviously. [Obs.]
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            Perish they
            That grudge one thought against your majesty !
                                                  --Shak.
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The Collaborative International Dictionary of English v.0.48:

Grudge \Grudge\, n.
   1. Sullen malice or malevolence; cherished malice, enmity, or
      dislike; ill will; an old cause of hatred or quarrel.
      [1913 Webster]

            Esau had conceived a mortal grudge and enmity
            against his brother Jacob.            --South.
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            The feeling may not be envy; it may not be
            imbittered by a grudge.               --I. Taylor.
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   2. Slight symptom of disease. [Obs.]
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            Our shaken monarchy, that now lies . . . struggling
            against the grudges of more dreaded calamities.
                                                  --Milton.

   Syn: Pique; aversion; dislike; ill will; hatred; spite. See
        Pique.
        [1913 Webster]

WordNet (r) 3.0 (2006):

grudge
    n 1: a resentment strong enough to justify retaliation; "holding
         a grudge"; "settling a score" [syn: grudge, score,
         grievance]
    v 1: bear a grudge; harbor ill feelings [syn: stew, grudge]
    2: accept or admit unwillingly