How do you spell Sock

Available Definitions:
1)  n. - A plowshare.
2)  n. - The shoe worn by actors of comedy in ancient Greece and Rome, -- used as a symbol of comedy, or of the comic drama, as distinguished from tragedy, which is symbolized by the buskin.
3)  n. - A knit or woven covering for the foot and lower leg; a stocking with a short leg.
4)  n. - A warm inner sole for a shoe.