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English definition of “top-up”

top-up

noun [C usually singular] (MONEY)    /ˈtɒp.ʌp/ US  /ˈtɑːp-/
an extra amount of something, especially money, that is added to an existing amount to create the total you need: The bank agreed to lend me a top-up of £500.Drinks - general words
(Definition of top-up noun (MONEY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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