We're on a budget, so we can't afford to eat at that restaurant.

to be head and ears in debt or in trouble

c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part[…], part 1, 2nd edition, London: […] [R. Robinson for] Richard Iones,[…], published 1592, OCLC 932920499; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire; London: Scolar Press, 1973, →ISBN, Act III, scene ii:

(officially)