To throw back and forth repeatedly, or to exchange words or ideas casually in conversation (like bandying about ideas).
From French 'bander' meaning 'to hit back and forth' (from tennis), which comes from 'bande' meaning 'band' or 'side.' Used in English since the 16th century, originally in sports contexts.
Tennis players literally 'bandy' the ball back and forth, which is where the original term comes from—but now we use it for any kind of back-and-forth exchange, like when politicians bandy about insults.
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