バイバイ

interjection

bye-bye; goodbye

Casual farewell, often used with children or in informal settings. Equivalent to English 'bye-bye'.

• バイバイ、また明日あしたね。

  Bye-bye, see you tomorrow.

noun, noun or participle which takes 'suru', intransitive verb

saying goodbye; parting

Noun and suru-verb use for the act of saying goodbye. Common in phrases like バイバイする.

• 子こ供どもは先せん生せいにバイバイした。

  The child said bye-bye to the teacher.