/ ˈdiːkɔɪ; NAmE / noun [ C ]
1.
an animal or a bird, or a model of one, that attracts other animals or birds, especially so that they can be shot by people who are hunting them
2.
a thing or a person that is used to trick sb into doing what you want them to do; going where you want them to go, etc.
► decoy / dɪˈkɔɪ/ verb [ vn ]
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WORD ORIGIN
mid 16th cent. (earlier as coy ): from Dutch de kooi the decoy, from Middle Dutch de kouw the cage, from Latin cavea cage.