Slang One that is powerful or influential: The big guns for the prosecution were its expert witnesses. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "big gun" in a sentence
"When it was time I got Mary up while the gun bearers got her rifle and my big gun from under the beds and checked the solids and the soft-nosed."
"Kongoni, the old gun-bearer, in the lead watching the blood spoor, Wilson watching the grass for any movement, his big gun ready, the second gun-bearer looking ahead and listening, Macomber close to Wilson, his rifle cocked, they had just moved into the grass when Macomber heard the blood-choked coughing grunt, and saw the swishing rush in the grass."
"We followed Droopy back in and it got worse and worse and I do not know about Pop but about halfway I changed to the big gun and kept the safety off and my hand over the trigger guard and I was plenty nervous by the time Droopy stopped and shook his head and whispered “Hapana.”"