| 例句 |
undergroundadjective undertaken or done so as to escape being observed or known by othersan underground operation to smuggle ancient artifacts out of the country backstairs, behind-the-scenes, clandestine, covert, furtive, hole-and-corner, hugger-mugger, hush-hush, private, privy, secret, sneak, sneaking, sneaky, stealth, stealthy, surreptitious, undercover, 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 being, situated, or operating beneath the surface of the earthan underground shopping mall that is part of the city's subway system undergroundnouna secret organization in a conquered country fighting against enemy forcesjoined the underground while still a teenager resistance cabal, conspiracy in the 14th century |