quadrilateral; quadrangle; tetragon
square; formal; prim; stuffy
to be square; to be angular; to be formal; to be stiff; to be strict
to be square; to be angular; to be formal; to be stiff; to be strict
harsh words make the going rough; consider your words; (lit.) a round egg can be cut into a square
winged bean (Psophocarpus tetragonolobus)