OneLook Thesaurus

Definitions of top up:
  • verb:   to refill (or recharge) something
  • verb:   (UK) to refill the drink of (somebody)
  • verb:   (idiomatic) to extend the credit of something
  • verb:   to add to a number or amount, to bring something up to a certain level
  • verb:   (transitive, intransitive, slang) To have sex (with).

(Definitions from Wiktionary)

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