来ちゃ

come (in 来ちゃだめ, “mustn’t come”), come (and…, as in 来ちゃう)

→ 来る
来 come; arrive + ちゃ Completive (often regretful)
verb · informal Rare #40,144
come (in 来ちゃだめ, “mustn’t come”) A colloquial contraction of 来ては in this use.
JA: ここに来ちゃだめだよ。
EN: You mustn’t come here.
come (and…, as in 来ちゃう) A colloquial contraction of 来てしまう in this use.
JA: 早くしないと、友達が来ちゃう。
EN: If we don’t hurry, my friend will come.
Conjugation of 来る

来ちゃだめだ。

You mustn't come.

急がないと外のヤツらが来ちゃ…

If we don't hurry, those guys outside are gonna come...

— AKIRA (1988)

来ちゃだめだと言ったろ!

I told you not to come!

— ライフ・イズ・ビューティフル (1997)

出て来ちゃだめ

You mustn't come out.

— 風の谷のナウシカ (1984)