From Longman Dictionary of Contemporary Englishpull your socks uppull your socks upespecially British English informalIMPROVE to make an effort to improve your behaviour or your work If they want promotion, United have got to pull their socks up. → sock
Examples from the Corpus
pull your socks up• You're not exactly a young lad any more so you've got to pull your socks up.• Maybe we needed to pull our socks up and we are trying to do just that.• With 16 games to go Oxford have still got time to pull their socks up. 