(espionage) A cover which is a position at a governmental agency (e.g. posing as a member of the diplomatic service).

(topology) A cover whose members are all open sets.

plural of cover crop

An instrument for locating rebars and measuring the depth of concrete that covers them.

plural of cover meter

(idiomatic) To shelter oneself

plural of covered bridge

(finance) An investment comprising two parts: (i) long stock, and (ii) short call option. It is an income-oriented strategy that is conservative in nature. The investor hopes to earn the time premium portion of the call option.

plural of covered call

Used other than figuratively or idiomatically: see break, cover. / (idiomatic, by extension) To disclose one's real thoughts and intentions.