A trumpet is a brass instrument that you play by blowing into its mouthpiece and pressing valves to form notes. If your older brother has trouble getting up in the morning, you can help him out by practicing your trumpet outside his bedroom door at six a.m.
Trumpets fall under the category of brass instruments, along with tubas and saxophones. When you play a trumpet, you need to use something called embouchure, the proper shaping of your mouth and lips so your breath buzzes against the mouthpiece in just the right way. Louis Armstrong and Miles Davis were famous jazz trumpet players. As a verb, to trumpet is to announce something very loudly, as if you were playing it on a trumpet.