top-up

Noun
  1. An amount needed to restore something to its former level (synset 113786353)
    domain region: britain, great britain, u.k., uk, united kingdom, united kingdom of great britain and northern ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
    is a type of: indefinite quantity - an estimated quantity

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