A word that means: "to break someone's lie"? I want to aggressively point out that she or he is lying

What word (or expression) can I use that means “to break someone's lie”?

I mean to aggressively point out that she or he is lying.

She stood up and ___ his lie/that he was a liar.

I'm thinking of debunk, but it doesn't seem suitable here.

You may want to consider using divulge or the phrase brought to light. Although, they are not very aggressive. A more aggressive term would be brand. As in , "She stood up and branded him a liar."

You might say you "exposed" that person as a liar.

That works mostly if it is to a larger audience of people. It loses some power if it's just two people arguing in a kitchen. I guess the connotation is that this person was lying to many people, and you "exposed" her to all of them.