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1. A crust discharged from and covering a healing wound.
2. Scabies or mange in domestic animals or livestock, especially sheep.
a. Any of various plant diseases caused by fungi or bacteria and resulting in crustlike spots on fruit, leaves, or roots.
b. The spots caused by such a disease.
4. Slang A person regarded as contemptible.
a. A worker who refuses membership in a labor union.
b. An employee who works while others are on strike; a strikebreaker.
c. A person hired to replace a striking worker.
intr.v. scabbed, scab·bing, scabs
1. To become covered with scabs or a scab.
2. To work or take a job as a scab.

[Middle English, from Old Norse skabb.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
The condition is contagious until all the spots have blistered and scabbed over, which usually happens about five or six days after the rash first appeared.
"Before the strike I'd chat with everyone in the village, but now I've blacklisted everyone who scabbed on us.