Sentence:  Backside, Frontside, Downside Up. I'll show you a plate, you show me a cup. I'll show you a window, you show me a door I'll show you a two, you show me a four. <WSD>Roundside</WSD>, Squareside, In Between. I'll show you a red, you show me a green. 
Meaning of the word marked with <WSD> tags:  On the curved side.