English, In grappling, this refers to the use of one's legs, the act of entangling them in a particular manner among the opponent's legs, so as to impede the opponent's use of their legs in assisting their escape. This is often used to stretch one's opponent from a prone position, with the arms controlling the upper torso, and the legs controlling the lower half of the body.
A situation where you are using arms, hands, legs, feet, or all of the above to literally form a hook around the body of the opponent. This action is used to control the opponent's body and manipulate it how you wish.