A stray eyelash
on someone’s cheek
means they have an eyelash wish
available. You, the eyelash finder, declare that you have found an eyelash, then gently lift it off their cheek with a finger and ask them to make a wish. They make their wish and blow it off your finger.
This is a nice thing to do with family members or someone you have crush on and long to get closer to.
It is one of those sweet things that can make someone’s day a little nicer.
(Awww. Mush mush.)