underwater

American  

[uhn-der-waw-ter, -wot-er] / ˈʌn dərˈwɔ tər, -ˈwɒt ər /

adjective

1. existing or occurring under water.

2. designed to be used under water.

3. located below a ship's waterline.

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adverb

1. beneath the water.

   to travel underwater.

noun

1. the water beneath the surface.

   cold currents in the underwater.

2. underwaters, the depths, as of a sea, lake, etc.

underwater British  

/ ˈʌndəˈwɔːtə /

adjective

1. being, occurring, or going under the surface of the water, esp the sea

   underwater exploration

2. nautical below the water line of a vessel

3. (of a stock option or other asset) having a market value below its purchase value

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adverb

1. beneath the surface of the water

Etymology

Origin of underwater

First recorded in 1620–30; under- + water

Example Sentences

See Examples For:

underwater

The production uses advanced equipment including remote underwater cameras, drones, and manned submersibles to capture newly discovered animal behaviours.

From BBC ● Oct. 7, 2026

As the age’s potent mix of terror and delirium spun on, designers and illustrators proposed ways to live comfortably in space, underwater or in underground bunkers.

From Los Angeles Times ● Oct. 7, 2026

The dizzying selloff has put many bonds underwater.

From MarketWatch ● Oct. 3, 2026

"Our house was underwater for about 30 hours," office worker Kosin Nilset, who lives along the Premprachakorn canal on the outskirts of the capital, told AFP on Sunday morning.

From Barron's ● Sep. 27, 2026

He waded into the creek, dived in, and swam underwater.

From "Flying Through Water" by Mamle Wolo

Related Words

• submerged
• undersea