| 例句 |
undercoveradjective undertaken or done so as to escape being observed or known by othersan undercover operation to infiltrate the terrorist organization backstairs, behind-the-scenes, clandestine, covert, furtive, hole-and-corner, hugger-mugger, hush-hush, private, privy, secret, sneak, sneaking, sneaky, stealth, stealthy, surreptitious, underground, underhand, underhanded back-channel, closed-door, off-the-books, off-the-recordclassified, confidential, restricted, top secret, undisclosedconcealed, hidden, secreted, subterranean, unadvertised, unexposed open, overt, public acknowledged, avowedaboveboard, straightforward, unconcealed, undisguisedunclassified, unrestrictedclear, evident, manifest, obvious, patent, plain working on missions in which one's objectives, activities, or true identity are not publicly revealedfor months she's been an undercover agent pretending to be a drug dealer secret covert, private, secretive, subterranean overt a person who tries secretly to obtain information for one country in the territory of another usually unfriendly countrywithin the city was a well-organized fifth column, and these undercovers would make themselves known as soon as the invading forces breached the city limits agent, asset, emissary, intelligencer, mole, operative, spook, spy couriercounterspy, double agent, sleeperinfiltrator, informer, stool pigeonspymaster, superspy secret agent, undercover agent in 1920 |