Mac Dictionary defines the instrument as:
a brass musical instrument with a flared bell and a bright, penetrating tone. The modern instrument has the tubing looped to form a straight-sided coil, with three valves.
• an organ reed stop with a quality resembling that of a trumpet.
• something shaped like a trumpet, esp. the tubular corona of a daffodil flower.
• a sound resembling that of a trumpet, esp. the loud cry of an elephant.
2 ( trumpets) a North American pitcher plant. • Genus Sarracenia, family Sarraceniaceae: several species, in particular yellow trumpets ( S. alata).
verb ( -peted , -peting )
1 [ intrans. ] play a trumpet : [as adj. ] ( trumpeting) figures of two trumpeting angels.
• make a loud, penetrating sound resembling that of a trumpet : wild elephants trumpeting in the bush.
2 [ trans. ] proclaim widely or loudly : the press trumpeted another defeat for the government.
blow one’s (own) trumpet talk openly and boastfully about one’s achievements : he refused to blow his own trumpet and blushingly declined to speak.
So don’t toot your own horn unless you’re a horn player of course.