0 something or someone used to trick or confuse people, especially something or someone that is not what they appear to be:
1 to trick or confuse people into doing something or going somewhere, especially by showing them something that is not what it appears to be:
3 a name that is placed on a company's mailing list (= list of names and addresses of people to whom advertising is sent) in order to check if the list is being used without the owner's permission
When a driver sees a patrol car, they don't know if it's a real police officer or if it's a decoy.
They used a girl hitch-hiker as the decoy to get him to stop.
The officer arrested a bike thief after planting "decoy" bikes around the city.
The spinning decoys try to mimic the flashing of a bird's wings, luring waterfowl toward the decoy.
Flares are canisters of magnesium that burst into very bright, very hot flame to decoy infrared receivers away from the plane.
They would try to decoy the enemy towards some of the hidden groups, where they would be outnumbered.
The plan is that Marie decoys the victim into a position that will give Bobbie plenty of time to take aim.
Cats often pretend to sleep to decoy their prey, then suddenly spring on it.