To Die
intransitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means death, so the verb version is to die.
The reading is the same as the one you learned with the kanji.
このスプレーで大体の虫は死ぬ。
Most insects die with this spray.
毎日、死ぬ気で力いっぱい生きています。
Every day, I live to my fullest power as if I'm dying.
夜に一人で山に入ったら、死ぬかもしれないよ。
There is chance you may die if you enter the mountain alone at night.