a watercraft that can operate underwater, designed for military or scientific purposes, a sandwich made on a long, cylindrical roll, typically filled with meat, cheese, and vegetables

Formal and Informal Expressions of submarine

In different contexts, you can replace 'submarine' with suitable alternatives. In a more formal setting, 'underwater craft' is apt. In informal speech or writing, 'sub' is a commonplace synonym.

submarine: Explore its Definition & Usage

submarine Definition

1a watercraft that can operate underwater, designed for military or scientific purposes
2a sandwich made on a long, cylindrical roll, typically filled with meat, cheese, and vegetables

Using submarine: Examples

Take a moment to familiarize yourself with how "submarine" can be used in various situations through the following examples!

Example
The navy uses submarines to conduct covert operations.
Example
The submarine dove to a depth of 500 meters.
Example
I ordered a meatball submarine sandwich for lunch.

submarine Synonyms and Antonyms

Synonyms for submarine

sub
U-boat
underwater craft

Phrases with submarine

submarine warfare
the use of submarines to attack enemy ships
Example
Submarine warfare played a significant role in World War II.
submarine volcano
a volcano that is located underwater
Example
Scientists discovered a new submarine volcano off the coast of Japan.
submarine cable
a cable laid on the seabed to carry telecommunication signals between countries
Example
The new submarine cable will connect Europe and South America.

Origins of submarine

from Latin 'sub-' meaning 'under' + 'mare' meaning 'sea'

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Summary: submarine in Brief

A 'submarine' [sʌbməˈriːn] is a watercraft designed to operate underwater, typically used for military or scientific purposes. It can also refer to a sandwich made on a long roll. Examples include 'The navy uses submarines to conduct covert operations.' and 'I ordered a meatball submarine sandwich for lunch.'