IPA: /trɒmˈboʊnɪst/
KK: /trɒmˈboʊnɪst/
A person who plays a musical instrument called the trombone, which is a brass instrument with a sliding mechanism to change pitch.
The trombonist played a beautiful solo during the concert.
Trombonist → It is formed from "trombone" (from Italian "trombone", meaning large trumpet) and "-ist" (meaning one who practices or is concerned with). A trombonist is one who plays the trombone, a brass instrument.
Think of a 'trombone' as a large trumpet, and remember that a 'trombonist' is someone who plays this instrument.