〜ちゃいけない・じゃいけない
〜ちゃいけない・じゃいけない means must not; not allowed to (casual prohibition). It is a JLPT N5 grammar point. This attaches to the te-form of a verb and means that doing something is not allowed. It is a spoken contraction of 〜てはいけない or 〜ではいけない, often used for rules and warnings.
Japanese sources describe it as 「してはいけない（話し言葉）」.
〜ちゃいけない・じゃいけない examples
ここで走っちゃいけない。
You must not run here.
あの水を飲んじゃいけない。
You must not drink that water.
〜ちゃいけない・じゃいけない exercises
Pick what belongs in the parentheses. The answer is marked below.
ここで走っ（ ）。
- ちゃいけない ✓
- てもいい
- てください
- てから
You must not run here.
この水を飲ん（ ）。
- でもいい
- じゃいけない ✓
- でください
- でから
You must not drink this water.
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