means A brass wind instrument with a flared bell and (usually) three valves, played by buzzing the lips to produce bright, carrying notes — or, by extension, the act of loudly announcing something.

from From Old French 'trompette,' a little 'trompe' (horn or trumpet), with the diminutive '-ette' tacked on — so literally a 'little trump.' 'Trompe' itself is of uncertain birth, possibly imitative of the blaring sound it makes, and likely Germanic in root. The same family gives us 'trump' in the old sense of a blast or fanfare; when you 'trumpet' your own success, you're metaphorically blowing that little horn, a figurative leap the word made centuries ago.