dummy NOUN (pl. dummies) 1) a model or replica of a human being. 2) an object designed to resemble and serve as a substitute for the real one. 3) Brit. a rubber or plastic teat for a baby to suck on. 4) (in sport) a feigned pass or kick. 5) informal, chiefly N. Amer. a stupid person.
VERB (dummies, dummied) feign a pass or kick.
sell someone a dummy — Cf. ↑sell someone a dummy
ORIGIN originally «a person who cannot speak», later «an imaginary fourth player in whist»: from DUMB(Cf. ↑dumbness).

English terms dictionary. 2015.

, / / (when only three persons play at whist)