take someone up on an offer - take advantage of someone's offer
You may not need a friend's help right away, but you may need it in the future. So if he offers to help, you can decline for now and then say that you might take him up on his offer in the future.
1. I don't need help with my English right now, but I might take you up on your offer in the fall when I start college.
2. It's ok if you can't help me move this weekend. Tom said to call him if I needed help. I can always take him up on his offer.
3. Sally said she could help me cook if ever I have a party, so I might take her up on her offer for next weekend.
Alright, are you ready to take someone up on an offer? Just give them a call, and say, "I'm ready to take you up on your offer to ... (help me with my homework).
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