A casual way of saying goodbye; used as a parting greeting, similar to "bye-bye".
友達と電話を切るときに「じゃあ、バイバイ」と言った。
When I hung up with my friend I said, "Okay, bye-bye."
小さな子どもはよく手を振ってバイバイをする。
Small children often wave and say "bye-bye."
パーティーの最後にみんなでバイバイと挨拶した。
At the end of the party everyone said "bye-bye" to each other.
The act or word of saying goodbye; can be used as a noun (the parting) or as a verbal phrase (to say bye-bye).
ホームパーティーの最後に短いバイバイが交わされた。
At the end of the house party, a brief goodbye was exchanged.
子どもはおもちゃを渡してバイバイした。
The child handed over the toy and said bye-bye.