on somebody's tail
on (one's) tail
Following or pursuing very close behind someone. The cops are on our tail—we have to lose them in the woods. Why is this guy sitting on my tail when I'm already going over the speed limit?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
on somebody’s ˈtail(informal) (of the police, a spy, etc.) following behind somebody very closely: I had the feeling there was someone on my tail.
Farlex Partner Idioms Dictionary © Farlex 2017