OVER ONE'S HEAD

{adv.} or {adj. phr.} 1. Not understandable; beyond your ability to understand; too hard or strange for you to understand. * /Mary laughed just to be polite, but the joke was really over her head./ * /The lesson today was hard; it went over my head./ Compare: BEYOND ONE'S DEPTH. 2. To a more important person in charge; to a higher official. * /When Mary's supervisor said no, Mary went over her head to the person in charge of the whole department./ * /If Johnny can't get what he wants from his big sister, he goes over her head and asks his mother./ 3. See: HANG OVER ONE'S HEAD.