be (sitting) on (one's) tail

To follow close behind someone or something. Why is this guy sitting on my tail when I'm already going over the speed limit? The cops are definitely on our tail now—we have to turn ourselves in!

Common Names:

Name	Pronounced	Usage
Wobbe	-	Frisian
Hendrik	HEN-drik (Dutch, German)	Dutch, German, Estonian
Amnon	-	Biblical, Biblical Hebrew, Hebrew
Jacinta	hah-THEEN-tah (Spanish), hah-SEEN-tah (Latin American Spanish)	Spanish, Portuguese
RoldÃO	-	Portuguese
Jocosa	-	Medieval English