"scab" in the noun sense
1. scab, strikebreaker, blackleg, rat
someone who works (or provides workers) during a strike
the crustlike surface of a healing skin lesion
"scab" in the verb sense
form a scab
"the wounds will eventually scab"
2. fink, scab, rat, blackleg
take the place of work of someone on strike
Source: WordNet® (An amazing lexical database of English)
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