ravel
v
(-ll-; US also -l-)
1 [I, Ip, Tn, Tn.p]
~ (sth) (up) (cause threads or fibres to) tangle and become knotted (使線或纖維)纏結.
2 [I] (of woven or knitted fabric) separate into threads; become untwisted; fray (使編織物或編結物)散成線, 綻線
Bind the edge of the rug so that it won't ravel. 給地毯鑲個邊以免開線. Cf 參看 unravel 1.