A sport played by four players where players have to hit a ball into other people's squares, and attempt to make a return hit.
A four-square cipher
Having four equal sides; square.
(by extension) Solid, robust.
Pertaining to a four-square cipher.
A boxy style of domestic architecture with four rooms to a floor, one of which is usually a stair hall.
Pertaining to the International Church of the Foursquare Gospel.