Similar words: under cover, undercoat, under consideration, under control, overcome, overcook, overcoat, from cover to cover. Meaning: adj. conducted with or marked by hidden aims or methods.
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(121) Since 1997 an average of 20 investigations each year had involved undercover work.
More similar words: under cover, undercoat, under consideration, under control, overcome, overcook, overcoat, from cover to cover, overcompensate, overconfident, undercut, underclass, under canvas, underclothes, undercharge, undercurrent, undercarriage, underachiever, cover, covert, underground, cover for, coverlet, recover, cover up, uncover, covered, underhanded, covering, covertly.