quid pro quo

noun
🔊/ˌkwɪd prəʊ ˈkwəʊ/
🔊/ˌkwɪd prəʊ ˈkwəʊ/
[singular] (from Latin)
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  1. a thing given in return for something else报偿;回报
    Word Originmid 16th cent. (denoting a medicine substituted for another): Latin, ‘something for something’.