From Longman Dictionary of Contemporary Englishbillfoldbill‧fold /ˈbɪlfəʊld $ -foʊld/ noun [countable] American EnglishDCMONEY a small flat leather case, used for carrying paper money, credit cards etc in your pocket SYN wallet
Examples from the Corpus
billfold• He checked the contents of his billfold and prayed over his gas gauge, that it stay above Empty round-trip. 