Store

The sign for "store" is made by bending both wrists and pointing both hands down. 

Pivot both of your hands toward and away from your body. 

Use a double motion.   If you use a single motion, this sign means "sell."  I've noticed though, that quite a few signers use the single motion to mean "store" and use the double motion to mean, "selling."  This is opposite the "noun/verb pair" principle.  So, even though I still teach that the "right" way to sign "store" is with a double motion, I also encourage my students to be flexible in the "real world."