Alternative form of have someone's back

plural of non-official cover

(philately) Alternative form of first day cover.

plural 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