■ plural noun
1》 a device with an air bag that emits a stream of air when squeezed together with two handles, used for blowing air into a fire.
↘a similar device used in a harmonium or small organ.
2》 an object or device with concertinaed sides to allow it to expand and contract, such as a tube joining a lens to a camera body.
Origin
ME: prob. from OE belga , plural of belig (see belly ).