Take somebody/something to the mat
Definition 1 of 1
Pro Tip 1/3Confrontational Tone
Implies a strong, forceful challenge, often with the resolve to not back down. 
He took his opponent to the mat over the unfair policy changes.
Pro Tip 2/3Figurative Use
Used metaphorically, referring to a duel-like confrontation, not a physical wrestling. 
The board member took the CEO to the mat during the meeting.
Pro Tip 3/3Assertive Stance
Shows someone taking a very assertive or aggressive position in an argument or dispute. 
The environmental group took the industry to the mat on pollution issues.