しちゃダメ

shouldn't

→ 為る
phrase Common #7,421
shouldn't A casual contraction of してはダメ, used to say that someone should not do something.
JA: そんなに心配しちゃダメだよ。
EN: You shouldn't worry so much.

自殺なんかしちゃダメよ。

You mustn't commit suicide.

つまみ食いしちゃダメよ

Don't sneak a taste.

— ウエスタン (1968)

あんな連中を信用しちゃダメです

You mustn't trust people like that.

— もののけ姫 (1997)

そんな難しい質問、私にしちゃダメよ。

You shouldn't ask me such a difficult question.

どうしてこれしちゃダメなの?

Why can't I do this?

そんなことしちゃダメだよ。

You mustn't do that.

気にしちゃダメよ

Don't let it bother you.

— PERFECT BLUE (1998)

ここ絶対妥協しちゃダメっすよ

You absolutely can’t compromise on this.

— One Cut of the Dead (2017)

そんな顔しちゃダメだよ

Don't make that face.

— 甘い生活 (1960)