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English definition of “top sth up”

top sth up

(MONEY) phrasal verb with top     /tɒp/ US  /tɑːp/ verb (-pp-)
to add more of something, especially money , to an existing amount to create the total you need: Students were able to take out loans to top up their grants . This is the easiest way to top up your mobile phone card . top-up payments Augmenting and supplementing
(Definition of top sth up (MONEY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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