Alternative form of cover one's bases

(idiomatic) To reveal that someone's behavior, situation, or identity has been fabricated or deliberately misrepresented for an ulterior motive.

Alternative form of have someone's back

(philately) Alternative form of first day cover.

(topology) A theorem which states that for any open covering of some given set in Euclidean n-space there is an open subcovering (of that same set) which is countable.

(figuratively) To conceal how one arrived at a certain result or position.

plural of edge covering number

(informal, figuratively) to protect or look out for someone

simple past tense of blow someone's cover

Third-person singular simple present indicative form of blow someone's cover