The wind blows many things, papers, leaves, hair. But the wind can blow other things, too. Secret things.
Get Wind of Something 听到某事的风声
Jonathan: I have news. Cara is getting married next weekend.
Anna: Uh-oh.
Jonathan: Uh-oh? Why uh-oh?
Anna: My friend Delonte still loves Cara. When he gets wind of this, he's going to be heartbroken.
Jonathan: Wow.
To "get wind of something" means to learn secret or important information in an indirect way. In the wild, many animals get information from the wind, too, like smells and sounds of other animals.