A feeling of anger or resentment that you hold onto against someone because of something they did to you in the past.
From Old French 'grouchier' meaning 'to grumble' or 'complain,' with roots possibly connected to the sound of growling or grunting, evolving to mean holding onto resentment.
The word 'grudge' might be onomatopoetic—it could come from the sound of growling, because when you hold a grudge, you're literally staying in a low, rumbling state of anger rather than letting it go.
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