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English definition of “top-up”

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top-up

noun [C usually singular] uk   /ˈtɒp.ʌp/ us    /ˈtɑːp-/

top-up noun [C usually singular] (LIQUID)

the act of putting more drink into someone's glass or cup: Your glass is nearly empty. Would you like a top-up? the act of adding liquid in order to fill to the top a container that is already partly full

top-up noun [C usually singular] (MONEY)

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