A covert operation typically involving activities that are highly clandestine and outside of standard military protocol.

plural of black operation

(historical) A type of stocking having decorative gaps in the fabric.

A device for putting a hole in a pipe. / A device or mechanism for clearing obstructions in a pipe. / (sports) A practice event; a warm-up.

present participle of open fire

Alternative spelling of uncooperative

Synonym of Peking opera

Third-person singular simple present indicative form of leave one's options open

present participle of leave one's options open

simple past tense and past participle of leave one's options open