up to eyeballs
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up to (one's) eyeballs (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 eyeballs 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 eyeballs! Dana was worried she wouldn't find any work as an accountant working for herself, but she's up to her eyeballs in clients!
*up to one's eyeballs
(in something) Go to up to one's neck (in something).