If you are on a boat and you cast off, you untie the rope that is keeping the boat in a fixed position. He cast off, heading out to the bay
A finishing technique used on threads using a half-hitch knot [Rees, 1813][Devlin, 1840]
Leading dancer goes down the set and returns around the outside of the line Alternately, all dancers turn outwards at the top of the set and return down the outside of the line
Prior to this movement, couples will have danced side-by-side across the set To cast off, partners separate, the gents moving anti-clockwise and the ladies clockwise around the set to meet again in the place opposite that from which they cast off
1 To let go a line, especially mooring or docking lines; 2 To remove the turns of a line from a cleat; 3 To untie a knot
If you cast off something, you get rid of it because it is no longer necessary or useful to you, or because it is harmful to you. The essay exhorts women to cast off their servitude to husbands and priests