over one’s head
over (one's) head
1. Too complicated to be understood by one. My jokes always seem to go over Stephanie's head, so I'm glad you think I'm funny at least. A lot of this technical stuff is way over my head.
2. Bypassing one's authority. She just wouldn't listen to me, so I had to go over her head to her boss and complain about it.
3. Lingering as a source of concern or worry for one. All these bills are hanging over my head, and I don't get paid for another week. I'm so glad that exam is over—it's been over my head for months.
over one’s head
mod. confusing; too difficult to understand. This stuff is too hard. It’s over my head.