up to the chin in or in --- up to the chin {adj. phr.}, {informal}
Used also with "ears", "elbows", "eyes" or "knees" instead of "chin", and with a possessive instead of "the".
Was Tom mixed up in that trouble last night? He was up to his ears in it.
Mr. Johnson is up to the eyes in debt.
Mrs. Smith is in debt up to her chin.
Compare: TO THE HILT.
Bob is up to his neck in homework.
They are up to their elbows in business before Christmas.
Mary was up to her knees in invitations to go to parties.
Compare: KNEE-DEEP. Categories: adjective informal