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English definition of “top-up”

top-up

adjective [before noun]
 
 
/ˈtɒpʌp/ US   /ˈtɑːp-/ UK FINANCE
used to describe extra money that is added to an amount so that the total is increased: Many universities charge their students top-up tuition fees.
(Definition of top-up adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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