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scab

noun
🔊/skæb/
🔊/skæb/
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  1. [countable] a hard dry layer that forms over and covers a wound on the skin as it gets better痂Topics Illnessc2
  2. [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 synonym blackleg
  3. [uncountable] a skin disease of animals（动物）疥癣
  4. [uncountable] a disease of plants, especially apples and potatoes, that causes a rough surface（植物）疮痂病，斑点病
    5. Word OriginMiddle 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’.