noun
submarine
suhb-muh-REEN
noun
1
A vessel built to travel underwater, especially beneath the sea.
"The crew spent six months aboard the submarine without surfacing."
adj
1
Existing, happening, or built for use underwater.
"Marine biologists study submarine volcanoes along the ocean floor."
verb
1
To sabotage or secretly destroy something, as if attacking it without warning.
"Rumors suggest a rival submarined the deal at the last minute."
How to Use Submarine
Learner’s notesIn plain EnglishMost often the underwater naval vessel; informally, "to submarine" something means to secretly undermine or torpedo it.
Common pairings
nuclear submarine
submarine warfare
submarine a deal
Word Forms
submarined past tense, submarines singular
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The crew spent six months aboard the _____ without surfacing.
Etymology
From sub- ("under") plus marine ("of the sea").