(IELTS4000) submarine | Definition: submersible warship; move forward or under in a sliding motion; underwater | (SAT5000) submarine | Definition: Existing, done, or operating beneath the surface of the sea. | | (ESS4000) submarine | Definition: A submarine is a boat that can go underwater for long periods of time. | Example: →The submarine dove under the sea so the enemy couldn’t see it. |