submarine

The word “submarine” means a vessel built to travel underwater, especially beneath the sea. In plain terms, most often the underwater naval vessel; informally, "to submarine" something means to secretly undermine or torpedo it.

“Submarine” is pronounced suhb-muh-REEN (/sʌb.məˈɹiːn/ in IPA).

Here is “submarine” used in a sentence: “The crew spent six months aboard the submarine without surfacing.”

Depending on how it is used, “submarine” can be a noun, an adjective and a verb.

“Submarine” is a fairly common word in modern English, usually learned at around the B1 level.

“Submarine” has 3 distinct senses listed in this dictionary. The most common is: a vessel built to travel underwater, especially beneath the sea.

A submarine is specifically built to travel underwater, especially beneath the sea, while a regular boat is designed to travel on the surface of the water. This underwater capability is what defines a vessel as a submarine rather than a boat or ship.

Used as a verb, to submarine something means to sabotage or secretly destroy it, as if attacking it without warning, much like a submarine strikes unseen from beneath the surface. It's often used in business or political contexts, such as 'they submarined the deal.'

Yes, submarine can describe anything existing, happening, or built for use underwater, as in 'submarine cables' or 'submarine volcanoes,' referring to structures or events beneath the sea's surface.