To sail around Cape Horn.

A coiled brass musical instrument, derived from the French hunting horn, which has rotary valves.

Alternative spelling of horndog

The cornucopia. / An edible chanterelle, Craterellus cornucopioides.

(music) An alto instrument of the clarinet family, pitched in F below middle C, with a range reaching down to F below that.

(nautical) a horn on a floating mine which, upon contact, releases an electrolyte that makes an electrical connection and initiates the explosion

A drinking-vessel made from the horn of an animal.

(music) a woodwind instrument similar to an oboe, but larger and pitched a fifth lower

(military) In naval mine warfare, a switch in a mine operated by a projecting spike.

(idiomatic) To come into conflict.