keep under cover

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keep under cover

1. Literally, to stay beneath a shelter of some kind, typically to avoid inclement weather. A: "How did you stay so dry in this downpour?" B: "I've been keeping under cover here, like we were supposed to!"
2. To hide something (often one's true identity or motives) from others. I need to keep under cover on this assignment so no one learns that I'm a spy.
See also: cover, keep