take up on
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take (one) up on (something)
To agree to an offer one had made, especially one made previously. I'm coming to town this weekend, so can I take you up on that spare bedroom you've offered me in the past?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
take someone up on something
to accept an offer that someone has made. That's a good offer. I'll take you up on it. Tom took Sue up on her offer of dinner.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.