decoy

Short definition from Wiktionary

Noun

1. 1
   A person or object meant to lure somebody into danger.
2. 2
   A real or fake animal used by hunters to lure game.
3. 3
   Deceptive military device used to draw enemy attention or fire away from a more important target.
4. 4
   An assembly of hooped or netted corridors into which wild ducks may be enticed (originally by tame ducks) and trapped.

Verb

1. 1
   To lead into danger by artifice; to lure into a net or snare; to entrap.
2. 2
   To act as, or use, a decoy.