Definition of cast-on:
(v) :
(physical) To move, or be moved, away.
(v) :
(now somewhat literary) To throw.
(v) :
To throw forward (a fishing line, net etc.) into the sea.
(v) :
To throw down or aside.
(v) :
(of an animal) To throw off (the skin) as a process of growth; to shed the hair or fur of the coat.
(v) :
(botany) To shed leaves or fruit prematurely.