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top sth up

Phrasal Verb with top
 
 
/tɒp/ verb [T] (present participle topping, past tense and past participle topped)

Definition

UK (US top sth off)
to add more liquid to a container in order to make it full
to add more of something, especially money, to an existing amount to create the total you need: Can I top up my mobile phone here?
(Definition of top sth up from the Cambridge Learner's Dictionary © Cambridge University Press)

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