1. a person who entices or lures another person or thing, as into danger, a trap, or the like.
2. anything used as a lure.
3. a trained bird or other animal used to entice game into a trap or within gunshot.
4. an artificial bird, as a painted wooden duck, used for the same purpose.
5. a pond into which wild fowl are lured for capture.
6. an object capable of reflecting radar waves, used as a spurious aircraft, missile, chaff, etc., for the deception of radar detectors.
to lure by or as if by a decoy: They decoyed the ducks to an area right in front of the blind.
to become decoyed: Ducks decoy more easily than most other waterfowl.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.