inside legBrE /ˌɪnsaɪd ˈleɡ/ 🔊NAmE /ˌɪnsaɪd ˈleɡ/ 🔊 (BrE) (NAmE in·seam) noun [singular] a measurement of the length of the inside of sb's leg, used for making or choosing trousers of the correct size 下落裆(裤腿内侧长度)