up to your neck
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up to (one's) neck in (something)
Having too much of something; overwhelmed by an excessive amount of something. I'm still unpacking my new house, so I'm just up to my neck in boxes. If any of my guys get hurt at the construction site, I'll be up to my neck in paperwork. There's no way I can take a vacation right now, I'm up to my eyes in work at the moment!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
up to your neckINFORMAL
COMMON If someone is up to their neck in a bad situation, they are very deeply involved in it. He was, at the time, up to his neck in charges of corruption. The Prime Minister was up to his neck in scandal.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012