work your guts out
US /wɜrk yʊər ɡʌts aʊt/
UK /wɜrk yʊər ɡʌts aʊt/

1.
拼命工作, 努力工作
to work extremely hard
:
•
I had to work my guts out to finish the project on time.
我不得不拼命工作才能按时完成项目。
•
She's been working her guts out all week to prepare for the presentation.
她这周一直在拼命工作,为演示做准备。