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English definition of “top sth up”

top sth up

verb uk phrasal verb with top   /tɒp/ us    /tɑːp/ (-pp-)

(LIQUID)

UK (US top sth off) to add liquid in order to fill to the top a container that is already partly full: Would you like me to top up your drink? Mix together some lemon juice and sugar, then top it up with water.

(MONEY)

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
(Definition of top sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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