'Socket' in the Bible

When the man saw that he could not defeat Jacob, he struck the socket of his hip so the socket of Jacob's hip was dislocated while he wrestled with him.

That is why to this day the Israelites do not eat the sinew which is attached to the socket of the hip, because he struck the socket of Jacob's hip near the attached sinew.

then let my arm fall from the shoulder, let my arm be broken off at the socket.