Definitions from Wiktionary ( )

▸ adjective:  Existing, relating to, or made for use beneath the sea.
▸ adjective:  Hidden or undisclosed.
▸ adjective:  (baseball) Of a pitch, thrown with the hand lower than the elbow.
▸ noun:  (nautical) A boat that can go underwater.
▸ noun:  A kind of sandwich made in a long loaf of bread.
▸ noun:  (baseball) A pitch delivered with an underhand motion.
▸ noun:  Any submarine plant or animal.
▸ noun:  (informal) A stowaway on a seagoing vessel.
▸ verb:  (intransitive) To operate or serve on a submarine.
▸ verb:  (transitive) To torpedo; to destroy with a sudden sneak attack.
▸ verb:  (intransitive, sometimes figurative) To sink or submerge oneself.
▸ verb:  (intransitive, automotive) To slide forwards underneath one's seat belt (during a crash or sudden stop).

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