| Main Entry: | gut-buster1 |
| Part of Speech: | n |
| Definition: | any activity requiring great effort, esp. physical |
| Etymology: | 1929 |
| Main Entry: | gut-buster2 |
| Part of Speech: | n |
| Definition: | a very funny joke |
| Etymology: | 1929; fr the idea that hard laughter causes stomach pain |
| Usage: | also gut-busting, (adj.) |