de·coy /ˈdiːkɔɪ/ noun [countableC] 1 TRICK/DECEIVEsomeone or something that is used to trick someone into going somewhere or doing something, so that you can catch them, attack them etc 诱饵,用作诱饵的人 Officer Langley acted as a decoy to catch the rapist. 警员兰利充当诱饵来抓捕那名强奸犯。
—decoy /dɪˈkɔɪ/ verb [transitiveT]