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top sth up

(MONEY) phrasal verb with top
 
/tɒp/
 
US  /tɑːp/ verb (-pp-)

Definition

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 paymentsAugmenting and supplementing
(Definition of top sth up (MONEY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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