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