を消す

turn off; erase or delete

→ を
phrase Very common #1,531
turn off; erase or delete Used with lights, televisions, radios, and other devices to mean “turn off,” and with names or items in a list to mean “erase” or “delete.” The particle を marks the thing being turned off or erased.
JA: 寝る前にテレビを消す。
EN: I turn off the television before going to bed.

寝る前に明かりを消すのを忘れないように

Don't forget to turn off the lights before going to bed.

黒板を消す

(Sound of erasing the blackboard)

— 映画 聲の形 (2016)

二度と会いたくないなら姿を消す

If you never want to see me again, then disappear.

— いまを生きる (1989)

を消すを忘れるな

Don't forget to put out the fire.

ラジオを消す

(Sound of the radio being turned off)

— 魔女の宅急便 (1989)

タバコを消すの、忘れないでよ

Don't forget to put out your cigarette.

俺の記憶を消すとはお前は卑怯な野郎だ

You're a cowardly bastard for erasing my memories.

— オールド・ボーイ (2003)

姿を消すんです

It disappears.

— ロード・オブ・ザ・リング/二つの塔 (2002)

眠る前にたばこを消すようにしなさい

Make sure to put out your cigarette before going to sleep.

彼女は台所からにおいを消すために窓を開けた

She opened the window to get rid of the smell in the kitchen.

出かける前には必ず電灯を消すようにしなさい

Be sure to turn off the lights before you leave.

消防士たちはを消すことができなかった

The firefighters couldn’t put out the flames.

煙草の火を消すのを忘れないでください

Please don't forget to put out your cigarette.

寝る前にテレビを消すのを忘れていた

I forgot to turn off the TV before going to bed.

いつ禁煙サインを消すのでしょう

I wonder when they'll take down the no-smoking sign.

を消すのよ

Turn off the light.

— 大人は判ってくれない (1959)

ガスを消すのを忘れた

I forgot to turn off the gas.

寝る前にテレビを消すのを忘れた

I forgot to turn off the TV before going to bed.