talk over (one's) head
talk over (one's) head
To talk about things that one cannot follow, understand, or comprehend. Your presentation shouldn't focus on the technical details too much; you don't want to talk over everyone's heads. I hate the way he always tries to talk over my head, as if I'm too dumb to understand what he's talking about.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
talk over someone's head
Fig. to say things that someone cannot understand; to speak on too high a level for one's audience. The speaker talked over our heads and we learned nothing. It is not a good idea to talk over your audience's heads.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
talk over someone's head
If someone talks over your head, they talk as if you are not present, often saying things you do not understand. The nurses were brilliant at explaining everything. However, the doctors talked over my head and rarely involved me in decisions. Compare with go over someone's head.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012