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Phrase(s): He who pays the piper calls the tune.
Prov. If you are paying for someone’s services, you can dictate exactly what you want that person to do. • When Mrs. Dalton told the artist what she wanted her portrait to look like, the artist cringed to think that anyone could have such bad taste. Still, he who pays the piper calls the tune, and Mrs. Dalton got what she wanted.
McGrawhill's American Idioms And Phrasal Verbs