(dummies)
1.
A ~ is a model of a person, often used to display clothes.
...the bottom half of a shop-window ~.
= mannequin
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2.
You can use ~ to refer to things that are not real, but have been made to look or behave as if they are real.
Dummy patrol cars will be set up beside motorways to frighten speeding motorists...
= fake
N-COUNT: oft N n
3.
A baby’s ~ is a rubber or plastic object that you give the baby to suck so that he or she feels comforted. (BRIT; in AM, usually use pacifier )
N-COUNT