Past tense of 'chum': to be close friends with someone, or to share living quarters together.
From 'chum,' which derives from 'chamber-mate.' The '-ed' suffix marks it as past tense in regular English verbs. Originally referred literally to sharing a chamber.
The verb 'chummed' captures something real about friendship—it originally meant the physical act of sharing space, showing how medieval people understood friendship as proximity and constant togetherness.
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