Pronunciation

/subˈmɜːrɪn/

Definitions

Noun

A submarine (also spelled sub or U-boat) is a type of naval vessel designed to operate primarily underwater. It is built to be crewed by a small number of people and is capable of independent or support missions, such as reconnaissance, surveillance, and offensive operations.

Verb

To submerge or go below (informally) means to enter or descend into the water using a submarine.

Phrases

• “Submerge a submarine” for the act of sending it underwater.
• “Surface from a submerged state” to come back up to the surface.
• “The submarine warfare tactics” refers to combat techniques used by submarines.

Example Sentences

• Noun: “The submarine was launched on a secret mission to track enemy vessels.”
• Verb: “The captain ordered the submarine to submerge before the enemy aircraft spotted them.”
• Action: “The crew prepared to surface after spending days submerged.”

Synonyms

• Sub
• Undersea craft -潜水艇 (dàowǒtǐ)
• Torpedo boat (informal, specifically referring to smaller submarines)
• Seaplane carrier (for larger, aircraft-carrying submarines)

Antonyms

• Surface ship
• Aircraft carrier
• Surface vessel