undercover UK [ˌʌn.də'kʌv.ər] US [-dɚ'kʌv.ɚ] adjective [before noun] ■working secretly using a false appearance in order to get information for the police or government (为给员警或政府搜集情报)秘密工作的,私下进行的•an undercover police operation警方的秘密行动 •an undercover detective便衣侦探,卧底探员 |