A hem on something such as a piece of clothing is an edge that is folded over and stitched down to prevent threads coming loose. The hem of a skirt or dress is the bottom edge.
VERB
缝…的褶边;给…镶边
If you hem something, you form a hem along its edge.
例句
Turn under and hem the outer edges...翻下来缝外侧的边。Each dress is hemmed and scrupulously checked for imperfections.每条连衣裙都缝上了褶边,并经过严格的检查,不允许有任何瑕疵。