must not eat
包み紙は食べちゃダメよ。
Don't eat the wrapper.
あー食べちゃダメえっ！
Ah, no, you can't eat that!
— すずめの戸締まり (2022)
食べちゃダメ
Don't eat it.
— もののけ姫 (1997)
寝る前に食べちゃダメよ。
You shouldn't eat before bed.