A person who catches crabs, either for commercial purposes or sport.
Agent noun formed from 'crab' plus the suffix -er, which creates nouns meaning 'one who does X.' This pattern has been used in English for over a thousand years.
The -er suffix is so fundamental that English speakers can instantly understand 'crabber' even if they've never heard it before—it's one of the language's most productive and flexible morphological tools.
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