Knavery is an old-fashioned word meaning:
* Deceitfulness: acting in a sly or cunning way to trick or mislead others.
* Dishonesty: acting in a way that is not truthful or fair.
The phrase suggests the speaker has:
* Realized the truth: They have discovered the deceitful nature of the people they're referring to.
* Experienced the consequences: The speaker may have been harmed or inconvenienced by the knavery.
* Understands their motives: They may have insight into why these individuals are acting deceptively.
Example:
"I see their knavery now. They were pretending to be our friends all along, but they were just trying to steal our secrets."