A device for delivering pressurized air in a controlled quantity to a controlled location. At its most simple terms a bellows is a container which is deformable in such a way as to alter its volume which has an outlet or outlets where one wishes to blow air.

(intransitive, transitive) To operate a bellows; to direct air at (something) using a bellows. / (intransitive, figuratively) To expand and contract like a bellows.

plural of bellow

Third-person singular simple present indicative form of bellow

To besiege; to surround with troops. / To vex, harass, or beset. / To exhaust.

Alternative form of belligerence

(idiomatic, intransitive) To be crazy or eccentric.

Alternative spelling of belly up

To die. / To fail or fold; especially, to close or shut down a business; to go out of business.

(idiomatic) Dead or defunct.