heavy artillery
Important, successful, or influential people. After failing to convince the IT department that implementing new network security controls would be in everyone's best interest, Mike felt it was time to bring in the heavy artillery, so he called a company meeting with the executive board. Hey, I'm just an admin clerk—I don't know if you're gonna be fired or not. That's for the heavy artillery to decide! Please don't bring in the heavy artillery. I know the CEO is your uncle, but can't we resolve this issue ourselves?
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