undercover

美音音标: [.ʌndə(r)'kʌvə(r)] undercover
英音音标: [.ʌndə(r)'kʌvə(r)] result.0.expl|add:"

同义
clandestine cloak-and-dagger hole-and-corner hugger-mugger hush-hush secret surreptitious undercover underground
词性
s
解释
conducted with or marked by hidden aims or methods
示例
clandestine intelligence operations|cloak-and-dagger activities behind enemy lines|hole-and-corner intrigue|secret missions|a secret agent|secret sales of arms|surreptitious mobilization of troops|an undercover investigation|underground resistance