① いずれも同一直線上にない4つの線分により構成される閉じた図形。4つの頂点と4つの辺をもつ。記号□。
to be square; to be angular; to be formal; to be stiff; to be strict
square; formal; prim; stuffy
winged bean (Psophocarpus tetragonolobus)
harsh words make the going rough; consider your words; (lit.) a round egg can be cut into a square