over one's head

Meanings

1. More complex or confusing than one can understand; beyond one’s comprehension.
2. More than one can handle; too much (especially in over one's head).
3. Performing at a level greatly superior to one's usual level of performance.
4. Directed to someone with authority over the person, so as to avoid requiring the approval of the person himself or herself.
5. Used other than figuratively or idiomatically: see over, head.