A duck used by a hunter to try to attract other ducks is an example of a decoy.
An attractive undercover police officer who is attempting to trick a man who is attacking woman into coming out and attacking her is an example of a decoy.
A police decoy.
To decoy troops into an ambush; to decoy ducks into a net.
Origin of decoy
- Possibly from Dutch de kooi the cage de the (from Middle Dutch to- in Indo-European roots) kooi cage (from Middle Dutch cōie) (from Latin cavea)
From American Heritage Dictionary of the English Language, 5th Edition