To come back together with someone or something, or to respond to something someone said.
From 're-' (again) + 'join' (from Latin 'jungere' meaning to connect). Can mean physically coming back together or verbally responding, both senses being about connection.
This word has two completely different meanings—you can 'rejoin' a club OR 'rejoin' an argument—but they both come from the same Latin root about bringing things together!
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