an influential or important person or thing:He's a big gun in science.
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How to use big gun in a sentence
It was the big gun atrocity of the day for the 24 hours before the Roswell shooting.With Guns, the Threatened Can Quickly Become the Threat | David Frum | January 14, 2014 | THE DAILY BEAST
He is either going to go out in a big gun battle or lay low.
The breakfast hour was enlivened by a continual peppering of small shot from her, varied by a big gun from her father.Alone | Marion Harland
It was the duck board, as much as the rifle and the big gun, which enabled the Canadians to win at Passchendaele last November.The Glory of The Coming | Irvin S. Cobb
Now they were abreast the famous Golden Tower, and a big gun was fired at them; but the shot went wide.Fair Margaret | H. Rider Haggard
British Dictionary definitions for big gun
informal an important or influential person
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012