at someone's heels

at someone's heels

1. (idiomatic) Following someone very closely.

• “snap at someone's heels”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “at someone's heels”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “at sb's heels”, in Collins English Dictionary.