From Longman Dictionary of Contemporary Englishbillhookbill‧hook /ˈbɪlhʊk/ noun [countable] DLGTZa tool that has a curved blade with a hooked point, used for cutting off tree branches etcOrigin billhook (1600-1700) bill “pole with a sharp blade at the end” ((11-21 centuries)) (from Old English) + hook