ばいならMeanings1expressiongoodbye; byecolloquialColloquial, casual farewell. Used mainly in informal spoken Japanese, often among friends or in relaxed settings.じゃあ、また明日あした。ばいなら!Well then, see you tomorrow. Bye!ばいなら、気きをつけて帰かえってね。Bye, take care on your way home.