be going great guns

be going great guns

To do something enthusiastically and successfully. He was hesitant at first, but now that he's been on the job for a month, he's going great guns.
See also: going, great, gun
Farlex Dictionary of Idioms.

be going great guns

INFORMAL
If someone or something is going great guns, they are doing something very well and succeeding. I was going great guns for the first 18 miles or so of the race. Business is going great guns.
See also: going, great, gun
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • if (one) is a day
  • if he is a day
  • if he's, she's, etc. a day
  • rattle off
  • be whistling in the dark
  • sticktoitiveness
  • be a moot point
  • be a moot point/question
  • moot
  • be a moot question