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.
      [1913 Webster]

            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.]
      [1913 Webster]

            Perish they
            That grudge one thought against your majesty !
                                                  --Shak.
      [1913 Webster]

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.
      [1913 Webster]

            The feeling may not be envy; it may not be
            imbittered by a grudge.               --I. Taylor.
      [1913 Webster]

   2. Slight symptom of disease. [Obs.]
      [1913 Webster]

            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

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "grudge":
   animosity, animus, antipathy, aversion, balk at, be unwilling,
   begrudge, bitterness, bone to pick, cast envious eyes,
   close the hand, covet, crow to pick, crow to pluck, deny, despite,
   dislike, enmity, envy, famish, grievance, hard feelings, hatred,
   hold back, ill will, injury, injustice, live upon nothing,
   malevolence, malice, maliciousness, malignancy, malignity, mind,
   not care to, not feel like, object to, peeve, pet peeve, pinch,
   pinch pennies, pique, rancor, refuse, resent, resentment, scamp,
   scant, screw, scrimp, skimp, spite, spitefulness, spleen, starve,
   stint, venom, withhold, would rather not