cast something off

Từ điển Oxford Advanced Learner 8th

▪ I. ˌcast sthˈoff derived
(formal)to get rid of sth because you no longer want or need it
•The town is still trying to cast off its dull image.
Main entry: ↑cast_derived
 
▪ II. ˌcast ˈoff | ˌcast sthˈoff derived
1. to undo the ropes that are holding a boat in a fixed position, in order to sail away
2. (in knitting)to remove stitches from the needles in a way that forms an edge that will not come undone
Main entry: ↑cast_derived