to be up to one's ears in something
[be] up to {one's} knees in {sth}to be up to one's ears in something
01
to be involved with something that is too challenging or demanding for one to handle
Idiom
Informal
例
With all the upcoming exams and projects, I'm up to my ears in work right now.
She's up to her eyes in wedding preparations and has no time for anything else.
