Origin of grutch
c.1200, grucchen, "to murmur, complain," from Old French grouchier "to murmur, to grumble," of unknown origin, probably ultimately imitative. Meaning "to begrudge" is c.1400. Cf. gruccild (early 13c.) "woman who complains," from grutch + suffix of unknown origin. Related: Grutched; grutching. As a noun from c.1400.