Real Dictionary

trumpet
variable noun: A trumpet is a musical instrument of the brass family which plays quite high notes. You play the trumpet by blowing into it.
verb: If someone trumpets something that they are proud of or that they think is important, they speak about it publicly in a very forceful way.
verb: When an elephant trumpets, it makes a loud sound.

trumpet in American English
a brass instrument with a bright tone, consisting of a tube in an oblong loop or loops, with a flared bell and, in the modern instrument, three valves for producing changes in key
to blow a trumpet
to sound on a trumpet
noun: any of a family of brass wind instruments with a powerful, penetrating tone, consisting of a tube commonly curved once or twice around on itself and having a cup-shaped mouthpiece at one end and a flaring bell at the other

trumpet in British English
noun: a valved brass instrument of brilliant tone consisting of a narrow tube of cylindrical bore ending in a flared bell, normally pitched in B flat. Range: two and a half octaves upwards from F sharp on the fourth line of the bass staff