The phrase "a big margin but" is correct and usable in written English.
It can be used when discussing a situation where there is a significant difference or gap, followed by a contrasting point or exception.
Example: "The team won the game by a big margin but still felt they could improve their performance."
Alternatives: "a large gap yet" or "a significant difference however".
We might not win by a big margin, but I still can't see us losing".
Exit polls have Mrs Clinton up by a big margin, but the visible ratio of Mr Obama's supporters to hers has been approximately 1,000 to 1.
If Mr Sukhumbhand loses, it would be calamitous for the DP and might even endanger the position of the party's leader, Abhisit Vejjajiva, who lost the last general election by a big margin but hung on as party leader.
Wales go into the game knowing they have to win and win by a big margin, but how big a margin will only dictate what happens later when Ireland play Scotland and then England host France.
The Londoners were favourites to win by a bigger margin but their four tries, which came via wing David Strettle, hooker Schalk Brits, full-back Alex Goode and fly-half Charlie Hodgson were good enough.
The visitors were favourites to win by a bigger margin but their four tries, which came from David Strettle, the tireless hooker Schalk Brits, the full-back Alex Goode and the fly-half Charlie Hodgson were good enough.
Garry Monk's side could have won by a bigger margin, but Montero and Gylfi Sigurdsson's long-range shots hit the woodwork.
Sure, a big margin is great, but elections are a zero-sum game -- someone wins, someone loses, and except in very rare circumstances, there ain't no middle ground.
Microsoft is the leader in the SaaS market by a big margin," Dinsdale told TechCrunch, but it trails dramatically when it comes infrastructure.
In the end, Mrs. May lost by 344 votes to 286, a slightly more respectable total than the two previous rejections, of 230 and 149 votes, but still a big margin.
"They have also lost their opening two games but not by a big margin.
