breathe down someone's neck

/B R IY1 DH D AW0 N S AH0 M W AH0 N EH0 S N EH0 K/
verb
  1. 1

    To follow or supervise someone too closely, causing discomfort for that person.

    โ€œMy boss never lets me get on with my work. He's always breathing down my neck and checking up on me.โ€

Source: https://en.wiktionary.org/wiki/breathe%20down%20someone's%20neck