go over someone's head - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

go over someone's head (third-person singular simple present goes over someone's head, present participle going over someone's head, simple past went over someone's head, past participle gone over someone's head)

1. (idiomatic) To take up an issue with another person's boss or other superior rather than beginning or continuing to deal with the original person.

   She went over his head and took her complaint directly to the president of the company.

2. (idiomatic) To escape someone's comprehension.

   I listened carefully, but the technical jargon went over my head.