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quid pro quo
Qui pro quo (Latin for "something for something" ) indicates a more-or-less equal exchange or substitution of goods or services.
Trivia about quid pro quo
Legally speaking, this Latin phrase means "something for something"
It's literally "something for something"
In "The Silence of the Lambs" Hannibal Lecter bargains with Clarice using this phrase meaning "What for what"
It's Latin for "something for something"; as in you do one thing for me, I'll do the same back for you