noun, noun or participle which takes 'suru', intransitive verb
submergence; immersion; going underwater
Used for objects, land, or structures being submerged in water, often due to flooding or accidents. Can also refer to intentional immersion. The する form is intransitive.
大雨で田んぼが水没した。
The rice fields were submerged by the heavy rain.
スマホを水没させてしまった。
I accidentally submerged my smartphone.