sirloin Pronunciation: /ˈsɜːlɔɪn/Translate sirloin | into French | into Italian | into Spanish German translation of sirloinn. 1 (Brit.) Roastbeef sirloin steak = Rumpsteak 2 (Amer.) Rumpsteaksirloin in other Oxford dictionaries Definition of sirloin in the British & World English dictionary Definition of sirloin in the US English dictionary