quid pro quo
noun/ˌkwɪd prəʊ ˈkwəʊ/
/ˌkwɪd prəʊ ˈkwəʊ/
[singular] (from Latin)- a thing given in return for something elseWord Originmid 16th cent. (denoting a medicine substituted for another): Latin, ‘something for something’.
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quid pro quo