Dummy

n. 1. One who is dumb. H. Smith.

2. A dumb-waiter. [Colloq.]
3. A sham package in a shop, or one which does not contain what its exterior indicates.
4. A figure on which clothing is exhibited, as in shop windows.
5. A locomotive with condensing engines, and, hence, without the noise of escaping steam.
6. The fourth or exposed hand when three persons play at cards.

To play dummy, to hold two hands at cards, one representing an absent person.