up to ears
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Related to up to ears: keep an ear to the ground, in one ear and out the other, up to neck
up to (one's) ears (in something)
Extremely busy (with something); deeply or overly involved (in something); possessing, filled up with, or overwhelmed by an excessive amount (of something). There's no way I can take a vacation right now, I'm up to my ears in work at the moment! I only meant to be peripherally involved in David's business venture, but before I knew it I was in up to my ears! Dana was worried she wouldn't find any work as an accountant working for herself, but she's up to her ears in clients!
up to one's ears
(in something) Go to up to one's neck (in something).
up to (one's) ears
Deeply involved or occupied fully: I'm up to my ears in work.