Present participle of grutch; the act of begrudging, resenting, or complaining about something.
From the same Scandinavian-influenced roots as grutched and grutches, the -ing form marks ongoing action in this Scottish/dialectal verb.
Words like 'grutching' show how English dialects developed parallel verb systems—while standard English lost this word, Scottish speakers kept it working perfectly in everyday speech for centuries.
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