Arguments or quarrels about small, unimportant things, or the third person singular form of the verb 'bicker'.
From Middle English 'bickeren,' possibly from Old Norse 'bika' meaning to attack or quarrel. The exact origin is uncertain, but it may be related to Old English words for striking or hitting, evolving to mean petty arguing.
The word 'bickers' perfectly captures how minor conflicts can ripple through relationships—linguists note it's often used for couples in long-term relationships who've mastered the art of disagreeing about absolutely everything, from who left the milk out to whose turn it is to fold socks.
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