cast off phrasal verb ( see also ↑ cast )
1 . to untie the rope that fastens your boat to the shore so that you can sail away
2 . cast somebody/something ↔ off literary to remove or get rid of something or someone that you no longer want or need:
His family had cast him off without a penny.
3 . to finish a piece of ↑ knitting by removing the stitches from the needle to make an edge that will not come undone
cast something ↔ off
Cast off four stitches.