Definition of gut-buster in English:

gut-buster

noun

informal
  • 1Something which hurts the stomach, literally or figuratively; something involving or requiring a large amount of effort or energy.

  • 2An exercise, or piece of exercise equipment, designed to help weight loss or strengthen the abdominal muscles.

Origin

1920s; earliest use found in William Faulkner (1897–1962), short-story writer and novelist. From gut + -buster, after to bust a gut.

Pronunciation

gut-buster

/ˈɡʌtˌbʌstə/