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bye bye

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bye-bye

[interj. bahy-bahy; n., adv. bahy-bahy]
–interjection
1. Informal. good-bye.
–noun
2. Baby Talk. sleep.
3. go bye-bye, Baby Talk.
a. to leave; depart; go out.
b. to go to sleep; go to bed.

Origin:
1700–10; appar. orig. nursery phrase used to lull a child to sleep, later construed as reduplicative form of by 2 , short for good-bye
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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