1 an act of saying that you are willing to do something for somebody or give something to somebodyoffer (of something) Thank you for your kind offer of help.to accept/refuse/decline an offerI took him up on his offer of a loan.You can't just turn down offers of work like that.an offer of marriageoffer to do something I accepted her offer to pay.
2 offer (for something) an amount of money that somebody is willing to pay for somethingI've had an offer of $2500 for the car.They've decided to accept our original offer.The offer has been withdrawn.They made me an offer I couldn't refuse.The original price was £3000, but I'm open to offers (= willing to consider offers that are less than that). see also o.n.o.
3 a reduction in the normal price of something, usually for a short period of timeThis special offer is valid until the end of the month.See next week's issue for details of more free offers.They have an offer on beer at the moment.Idioms

ˈɒfə(r)
ˈɔːfər