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Từ điển Oxford Advanced Learner 8th
top-up
ˈtop-up [top-up top-ups] BrE NAmE noun (BrE)
1. a payment that you make to increase the amount of money, etc. to the level that is needed
•a phone top-up (= to buy more time for calls)
•Students will have to pay top-up fees (= fees that are above the basic level).
2. (informal)an amount of a drink that you add to a cup or glass in order to fill it again
•Can I give anyone a top-up?
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