breathe down somebody's neck
breathe down (one's) neck
1. To monitor someone closely, usually in an overbearing and irritating way. I just got another email from the boss asking about the status of this report, as if breathing down my neck is going to make me finish it faster!
2. To be physically close to someone in an unnerving or unwanted way. Back up, dude—I'll never make this shot with you breathing down my neck!