undercover
adj[esp attrib尤作定语]
1 doing things secretly or done secretly; surreptitious 暗中进行的; 秘密做出的; 私下的
,undercover`payments, eg bribes 暗中付的款(如贿赂).
2 engaged in spying on people while appearing to work normallyamong them 做密探工作的
,undercover `agents, activities ,organizations 密探、 秘密活动、 进行秘密活动的组织
detectives working undercover 掩人耳目行事的侦探.