Meaning of “underwater” in the English Dictionary

british dictionary

"underwater" in British English

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underwateradjective, adverb

uk /ˌʌn.dəˈwɔː.tər/ us /ˌʌn.dɚˈwɑː.t̬ɚ/

B2 under the surface of the water, especially under the surface of the sea:

an underwater camera (= a camera that you can use underwater)
Some species of turtle can remain underwater for 24 hours.

(Definition of “underwater” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"underwater" in American English

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underwateradjective, adverb [ not gradable ]

us /ˌʌn·dərˈwɔt̬·ər, -ˈwɑt̬-/

under the surface of water, esp. under the surface of the sea:

an underwater camera
Some ducks can stay underwater for nearly two minutes.

(Definition of “underwater” from the Cambridge Academic Content Dictionary © Cambridge University Press)