Newcastle UK /ˈnjuːˌkɑːsl̩/US /ˈn(j)uˌkæsl̩/noun 2phrases 2 noun2 •A large city and metropolitan borough of Tyne and Wear, in northeastern England. •A large city in New South Wales, Australia, situated at the mouth of the Hunter River. Phrases with Newcastle carry coals to NewcastleTo do something that is unneeded or redundant. coals to NewcastleA pointless venture, in the sense of sending something to a place where it is made, or where they already have an abundance.