get in someone's hair
US /ɡɛt ɪn ˈsʌm.wʌnz hɛr/
UK /ɡɛt ɪn ˈsʌm.wʌnz hɛr/

1.
to annoy someone by being present all the time and bothering them
:
•
My little brother always seems to get in my hair when I'm trying to study.
•
I need some space; you're really starting to get in my hair.