bust a gut
US /bʌst ə ɡʌt/
UK /bʌst ə ɡʌt/
1.
to laugh very hard
:
•
The comedian was so funny, I almost bust a gut laughing.
•
Every time he tells that story, I bust a gut.
2.
to work extremely hard
:
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He had to bust a gut to finish the project on time.
•
They're really busting a gut to get this new product launched.