swap notes on (someone or something)

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swap notes on (someone or something)

To share or exchange information (about someone or something) in a casual or informal manner. Opposing lawyers are always depicted as enemies on TV and in movies, but they are often friends outside of court who swap notes on other cases they're involved with. If you think that only guys swap notes on the people they've slept with, then you're just being naïve. Tom is coming over to swap notes on our physics exam.
See also: note, on, swap