bye-bye

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a farewell remark
- they said their good-byes
• Syn:
adieu, adios, arrivederci, auf wiedersehen, au revoir,
bye, cheerio, good-by, goodby, good-bye, goodbye,
good day, sayonara, so long
• Hypernyms:
farewell, word of farewell