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Verb: top up
  1. To fill something to the brim or to a desired level
    "Could you top up my coffee, please?"
Noun: top-up  'tóp,úp
Usage: Brit, Cdn
  1. An amount needed to restore something to its former level
    "He needed a top-up of fuel before the long drive"

Derived forms: top-ups, topping up, tops up, topped up

Type of: indefinite quantity

Encyclopedia: Top up