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消えちゃう

disappear

→ 消える
消え go out, disappear + ちゃう Completive (often regretful or unintended)
verb · present irrealis Rare #41,871
disappear Casual contraction of 消えてしまう, often expressing that something disappears completely or unexpectedly, or regret that it does.
JA: 電気を消すと、画面が消えちゃう。
EN: If you turn off the electricity, the screen will disappear.
Conjugation of 消える
Irrealis present
消えちゃう

消えちゃうよ

It'll disappear.

— ハウルの動く城 (2004)

ソフィー消えちゃうよ

Sophie is going to disappear.

— ハウルの動く城 (2004)

おいら消えちゃうよ

I'm gonna disappear.

— ハウルの動く城 (2004)

でも何も証拠が残ってないってのも…すぐに消えちゃうんだって

But apparently, any evidence disappears right away, too...

— 天気の子 (2019)