ちゃいかん LinksSentence search for ちゃいかんEdit in JMdict Expressions (phrases, clauses, etc.)1. must not docol. form of ..てはいけないエンジンをからまわ空回りさせちゃいかん。ながも長持ちさせたいからね。Don't race the car. We want to make it go as far as possible. Discussions Log in to talk about this word.