to unfasten or untie (a boat or line)
to remove (a stitch or stitches) from a knitting needle to form an edge that will not unravel
to get rid of or discard (something)
She cast off all restraint
to estimate or calculate the amount of space that (text) will take up when printed
to unfasten or untie a boat or a line
to finish a knitted article by casting off all the stitches