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Từ điển Oxford Advanced Learner 8th
drop off
ˌdrop ˈoff derived
(BrE, informal)
1. to fall into a light sleep
Syn: fall asleep
•I dropped off and missed the end of the film.
2. to become fewer or less
•Traffic in the town has dropped off since the bypass opened.
Main entry: ↑dropderived
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