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Definition of Up to my neck
1. Adjective. Deeply involved. "Up to their necks in debt" 
Exact synonyms: Neck-deep, Up To Her Neck, Up To His Neck, Up To Our Necks, Up To Their Necks, Up To Your Neck
Similar to: Involved
Similar to: Involved
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1. Adjective. Deeply involved. "Up to their necks in debt"