bye bye[interjection]Synonyms: good-bye, adieu, by, cheerio, farewell, so long, toodle-oo
[TahlilGaran] English Synonym Dictionary ▲
bye-ˈbye interjection informal goodbye – used especially when speaking to children, friends, or members of your family:
Say bye-bye to Daddy, Tommy. [TahlilGaran] Dictionary of Contemporary English ▲