work your socks off
work (one's) socks off
To work really hard (on or at something). I know you thought it was just a silly New Year's resolution, but I've been working my socks off at the gym! Sally and Jim work their socks off when we hold our consumer conference each year. I don't know what I'd do without them!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
work your socks offINFORMAL
If you work your socks off, you work extremely hard. They worked their socks off to make the business succeed. Note: You can use this expression with many other verbs, especially verbs related to performing such as dance, act and play. In each case, it means `a lot' or `very well'. I danced my socks off last night. Capper is currently playing his socks off for Sheffield Wednesday.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012