Definition of pay up or pay something up in English:

pay up (or pay something up)

Pay a debt in full: you’ve got ninety days to pay up the principal
More example sentences
  • And if you have old debts, pay them up, until you are free of outstanding financial debts.
  • Admission is by ticket only and no one can get in unless they are paid up and can produce their ticket.
  • He also said that no one should play until all his or her fees are paid up.
Synonyms
make payment, pay, settle up, pay in full, meet one's obligations, come up with the money
informal fork out/up, come across, cough up
British informal stump up
See parent entry: pay

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