[mass noun]the tenderest part of a loin of beef, pork, etc., taken from under the short ribs in the hindquarters (牛、猪等的)背骨以下腰部内侧嫩肉,里脊肉,嫩腰肉 ■(US)the undercut of a sirloin (美)牛腰部软肉;牛里脊
(N. Amer. informal)a district of a city where vice and corruption are prominent (北美,非正式)(城市中罪恶和腐败蔓延的)油水区,是非之地