Work your tail off
Meaning: to work until you are so tired that you cannot work any more, also work till / until you drop
Example: Bob worked his tail off to save money for his son's education.
Выучи грамотный разговорный английский до уверенного владения всего за 9 месяцев по системе естественного усвоения иностранных языков. Жми!
Example: Bob worked his tail off to save money for his son's education.