noun
trombone
trom-BOHN/trɑːmˈbəʊn/
A brass musical instrument usually played by moving a slide to change pitch.
The trombone has a long, extended U-shaped slide for changing pitch.

Etymology
The pieces mean “large trumpet”: the name places the trombone in the trumpet family and emphasizes its size, rather than describing the sliding tube that changes its pitch.
In context
even tried to learn the trombone so that he could join the jazz band
More examples
- Two trombones play the melody in the marching band.
- He practices the trombone for half an hour each evening.
- The jazz piece opens with a trombone solo.
Forms
trombone · trombones
trombonist noun — A musician who plays the trombone.