on one's heels
01
closely following or pursuing someone or something, often in a persistent or bothersome manner
![on {one's} [heels] definition and meaning](https://cdn.langeek.co/photo/42800/original/?type=jpeg "on {one's} [heels] definition and meaning")
Idiom
Informal
例子
He is constantly on my heels, checking my every move and questioning my decisions.
She always hovers on my heels, never giving me a moment of privacy or independence.
02
near the point of surpassing a fellow competitor
![on {one's} [heels] definition and meaning](https://cdn.langeek.co/photo/66324/original/?type=jpeg "on {one's} [heels] definition and meaning")
IdiomInformal例子
If she does poorly on this exam, she may lose the title of valedictorian to one of the students on her heels.
The leading candidate should be concerned about the underdog on his heels.
