great guns

adverb

Definition of great guns 

: with unremitting vigor or energy reaching the age of 78 … and still going great gunsNew York Times also : eminently successfully an enterprise that began slowly but after a while began to go great guns often used interjectionally to express astonishment

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First Known Use of great guns

1913, in the meaning defined above

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The first known use of great guns was in 1913

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