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operate covertly (surreptitiously / under cover VLZ_58); take cover (VLZ_58); go underground (VLZ_58); go under an alias (VLZ_58) | |||
fly under the radar | |||
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make clandestine (Anglophile); provide cover (Anglophile); hush up (Anglophile); keep dark (Anglophile) | |||
make secret (impf of законспирировать); conspire (impf of законспирировать) | |||
make secret |