Meaning : Deeply involved.
Example :
Neck-deep in work.
Up to their necks in debt.
Synonyms : neck-deep, up to her neck, up to his neck, up to my neck, up to our necks, up to their necks
Up to your neck ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Marathi. Up to your neck ka matlab kya hota hai?