scab

n 1 [C, U] dry crust formed over a wound or sore as it heals 痂. 2 [U] disease of skin or plants causing scab-like roughness 疥癣: sheep-scab 羊疥癣. 3 [C] (infml derog 口, 贬) worker who refuses to join a strike or a trade union, or who takes the place of a striker; blackleg 拒绝参加罢工的工人; 拒不参加工会的工人; 顶替罢工者工作的人; 工贼.

savoy, savvy, saw, saw-horse (US also `sawbuck), sawdust, sawmill, sawyer, sax, saxifrage, Saxon, saxophone, saxophonist, say, say nothing about, say to oneself, say yes, say-so, SAYE, saying, sc, scabbard, scabby, scabies, scabious, scabrous, scad, scads, scaffold, scaffolding, scalar, scalawag, scald, scalding, scale, scalene, scales, scallion, scallop (also scollop), scallywag, scalp,