grudge v.

c. 1200, grucchen, "to murmur, complain, find fault with, be angry," from Old French grouchier, grocier "to murmur, to grumble," of unknown origin, perhaps from Germanic, probably ultimately imitative. Meaning "to begrudge" is c. 1400. Compare gruccild (early 13c.) "woman who complains," from grutch + suffix of unknown origin. Related: Grutched; grutching. As a noun from c. 1400.

late 14c., bigrucchen, "grumble over, find fault, show dissatisfaction," especially "envy the possession of," from be- + Middle English grucchen "to murmur, find fault with, be angry" (see grudge). Related: Begrudged; begrudging; begrudgingly.