Subversion means overthrowing something, like a government or law, or it can mean corrupting someone’s personal morals, like making a vegetarian eat bacon by tricking her.
The Latin root subvertere means “to turn from below,” and when you turn something on its head in a sneaky way, that’s subversion. Imagine digging a hole in the ground, then covering the hole with a layer of sticks and leaves. When someone walks on it, they fall in. That’s the basic idea of subversion, attacking from below. People often use subversion to take down a corrupt government, and acts of subversion are a powerful way to protest injustice.