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The Collaborative International Dictionary
To sing placebo

Placebo \Pla*ce"bo\, n. [L., I shall please, fut. of placere to please.]

  1. (R. C. Ch.) The first antiphon of the vespers for the dead.

  2. (Med.) A prescription with no pharmacological activity given to a patient to humor or satisfy the desire for medical treatment.

  3. (Med.) a dose of a compound having no pharmacological activity given to a subject in a medical experiment as part of a control experiment in a test of the effectiveness of another, active pharmacological agent.

    To sing placebo, to agree with one in his opinion; to be complaisant to.
    --Chaucer.