trombone

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Rhymes with (UK) -əʊn, (US) -oʊn

Borrowed from Italian trombone, from tromba (“trumpet”) + -one (augmentative), literally “large trumpet”.

The telecommunications sense alludes to the shape of the musical instrument.

A musical instrument in the brass family, having a cylindrical bore, and usually a sliding tube (but sometimes piston valves, and rarely both). Most often refers to the tenor trombone, which is the most common type of trombone and has a fundamental tone of B♭ˌ (contra B♭). Jim plays the trombone very well.
The common European bittern.
A kind of extendable support for attaching lighting elements to a set. The trombone […] permits an instrument to be positioned over a studio set wall, enabling the set wall to support the weight of the instrument.

To transmit a signal or data back to a central switching point before sending it out to its destination.
slang, transitive To extend and retract (the zoom lens); to use it too enthusiastically. […] do things wrong (like rotating the lens turret while shooting or backwinding and doing multiple passes on the same strip of film or doing in-camera fades with the variable shutter or tromboning a zoom lens like a teenager on acid, etc., etc., etc.) […]