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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 someone's tail
Inf. Fig. following someone closely. (See also on someone's heels.) There is a huge truck on my tail. What should I do? Keep on her tail and don't let her out of your sight.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.