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Going Down, Submersion
noun, する verb
If you sink and die it's because you were sinking in the ocean or a pool or something. It's important to notice you're going down so you don't die like that.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
There’s a person who predicted the sinking of the Titanic.