great guns

noun
1.
Informal. in a relentlessly energetic or successful manner: The new president has the company going great guns.
2.
(used as an expression of surprise, astonishment, etc.).

Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Idioms & Phrases

great guns

  1. Very energetically or successfully. This colloquial expression usually occurs in the phrase go great guns, as in They're going great guns with those drawings. The expression comes from British naval slang of the late 1700s, when blowing great guns meant a violent gale. Harry Truman used the term in Dear Bess (1945): "We have been going great guns in the last day or two."

  2. great gun. Also big gun. An important person, as in All the great guns came to the reception. This usage is heard less often today. [Slang; early 1800s] Also see big cheese.

  3. Great guns! An expletive expressing surprise or astonishment, as in Great guns! You're not leaving now? [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
We also know that some places move slowly and some go great guns from the start depending on local factors and conditions.
Tho great guns stare up at tho blue sky from behind steep bulwarks.
The thunder of great guns and the dashing of cavalry are the incidents.
Idioms & Phrases
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