take (someone) up on (something)
to accept (an offer or invitation) from someone.
I think I'll take him up on his offer of a free ticket.
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。