english
1
general::
Phrase(s): work one’s tail off [and] work one’s buns off; work one’s ass off; work one’s butt off Inf. Fig. to work very hard. (Use caution with butt.) • I worked my tail off to get done on time. • You spend half your life working your butt off— and for what?
McGrawhill's American Idioms And Phrasal Verbs