a model that is the shape and size of a person, especially used in order to show clothes in a shop or when you are making clothes:
a shop-window dummy
a tailor's dummy
an object that is made to look like a tool, weapon, vehicle etc but which you cannot use:
During practice runs, the warheads in the missiles will be dummies.
a small model of a person, with a mouth that can be moved so that it looks as though it is talking, used for entertainment:
a ventriloquist's dummy
a move in a sport such as football in which a player pretends to pass the ball but does not, in order to deceive the other team's players
a specially shaped rubber object that you put in a baby's mouth for it to suck [= pacifier American English]
for babiesDHB British English
someone who is stupid:
stupid personespecially American English informal
No, you dummy. The other hand.
cards that are placed on the table by one player for all the other players to see in a game of bridge