Definition of submarine
- submarine Adjective Under water.
- submarine Adjective Of something hidden or undisclosed, e.g. "submarine patent".
- submarine Noun A boat that can go underwater.
- submarine Noun A kind of sandwich made in a long loaf of bread.
- submarine Noun Pitch delivered with an underhand motion.
- submarine Verb To operate or serve on a submarine
- submarine Verb To torpedo; to destroy with a sudden sneak attack