"increase his offer" is a correct and usable part of a sentence in written English.
You can use it when some kind of negotiation is taking place, usually in the context of a dispute between two parties. For example, "The tenant wanted to drive a hard bargain, but the landlord decided to increase his offer."
Mr Johnson said he might increase his offer.
The buyer refused to increase his offer because the apartment, which was part of an estate sale, needed a total renovation.
It's time for the chief executive, Sergio Marchionne, to increase his offer for the remaining stake, Olaf Storbeck of Reuters Breakingviews writes.
A spokesman for Mr Weston refused to say whether he would increase his offer in the wake of a counterbid from Mr Tchenguiz.
Some observers believe he is preparing to increase his offer to 550p a share, well above the 515p bid from CSN's chairman Benjamin Steinbruch.
Rupert Murdoch does not plan to raise his bid for Newsday in an attempt to match a higher offer from Cablevision, while Mortimer B. Zuckerman has not signaled whether he will increase his offer, The New York Times reported.
The pickets said they would return every day until Mr. Kriegman increased his offer.
He said he plans to run any serious offers pastPhillips, who has not increased his offer of three years.
He noted that Mr. Barak, who started out talking about turning over 50percentt of the land, had increased his offer most recently to 88percentt -- 78 percent now and 10percentt over time.
But two years ago, when a Yankee deal with Albert Belle suddenly fell apart just as Williams was about to sign with the Boston Red Sox, Steinbrenner increased his offer to Williams by $27.5 million within the span of 20 minutes.
DFS Furniture, Britain's largest upholstered-furniture retailer, agreed to be bought by its chairman, Graham Kirkham, for £496 million ($914 million) after the company's 59-year-old founder increased his offer a second time.
