To Extinguish Something
To Erase Something, To Turn Something Off
transitive 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 extinguish so the verb vocab version is to extinguish something. You can also use this word to say to erase something, like data, and to turn something off, like the lights or the power. Technically you're extinguishing the data, as well as the lights or power, right?
けす
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
The kettle is getting too hot so it catches on fire. You have to extinguish the flames before your house burns down too, just because of this stupid little kettle.
消したい過去があるんです。
I have a past that I want to erase.
間違えてデータを全部消しちゃったんだよ。
I erased all the data by mistake.
教室を出た後は電気を消すのを忘れないで下さい。
After you leave the classroom, please don’t forget to turn off the light.