Sentence:  This <WSD>trombone</WSD> is very expensive. 
Meaning of the word marked with <WSD> tags:  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♭).