An item that has been discarded or rejected. The thrift store was filled with castoffs from the local community.
A person who is rejected or dismissed from a group or society. He felt like a castoff after being excluded from the team.
The method or act of finishing knitted fabric by removing live stitches from the needles. Her castoff was too tight, so the edge of the scarf puckered.
An estimate of the amount of space that text will occupy when set in type or laid out. The production manager prepared a castoff before sending the manuscript to the printer.