ravel
v
(-ll-; US also -l-)
1 [I, Ip, Tn, Tn.p]
~ (sth) (up) (cause threads or fibres to) tangle and become knotted (使线或纤维)缠结.
2 [I] (of woven or knitted fabric) separate into threads; become untwisted; fray (使编织物或编结物)散成线, 绽线
Bind the edge of the rug so that it won´t ravel. 给地毯镶个边以免开线. Cf 参看 unravel 1.