pay up[verb]Synonyms: clear, clear off, discharge, liquidate, pay, quit, satisfy, settle, square
 [TahlilGaran] English Synonym Dictionary ▲
 pay up phrasal verb (
see also pay)
 to pay money that you owe, especially when you do not want to or you are late: 
 She refused to pay up.
 She refused to pay up. ⇒ 
paid-up  [TahlilGaran] Dictionary of Contemporary English ▲