Definition of deep in debt:
(adj) :
relying upon; depending upon; (of certain
Irish irregular verbs): standing only after a preverbal particle
"at that point I was dependent on financial aid for my tuition."
(n) :
one who relies on another for support; an element in phrase or clause structure that is not the head. Includes
complements
modifiers and
determiners
"with two children and an ailing mother, she had three dependents in all ... (In British English, this meaning is spelt
dependant.)"