scab
noun /skæb/
/skæb/
- [countable] a hard dry layer that forms over and covers a wound on the skin as it gets better
痂 - [countable] (informal, disapproving) a worker who refuses to join a strike or takes the place of somebody on strike
拒绝参加罢工的工人；顶替罢工者上班的工人；工贼 - [uncountable] a skin disease of animals
（动物）疥癣 - [uncountable] a disease of plants, especially apples and potatoes, that causes a rough surface
（植物）疮痂病，斑点病
词源Middle English (as a noun): from Old Norse skabb; related to dialect shab (compare with shabby). The sense ‘contemptible person’ (dating from the late 16th cent.) was probably influenced by Middle Dutch schabbe ‘slut’.