top-up - definition and synonyms

noun [countable] British 

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singulartop-up
pluraltop-ups
  1. 1
    an amount of liquid added to a glass or cup that someone is drinking from in order to fill it

    Can I have a top-up, please?

  2. 2
    an amount of money added to other money in order to reach the necessary level

    a top-up loan