Definition of top-up in English:

top-up

Line breaks: top-up

Entry from British & World English dictionary

noun

British
1An additional or extra amount or payment that restores something to the level that is required: they will miss out on hundreds of pounds worth of pension top-ups [as modifier]: top-up fees for university students
1.1A quantity of a drink that refills a partly full glass or cup: he headed back to the bar for a top-up

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict