go over your head
Meaning: If someone goes over your head, they go to someone with more authority than you in order to get something that you would normally grant, possibly because they think you won't give it to them.
- He knew I wouldn't give him time off, so he went over my head and asked my boss.
- I wouldn't go over her head if I were you. It'll make her angry, and next time you ask her for something she might say no.