Crab

A crab is any of various crustaceans with four pairs of legs, a pair of pincers, a flattish shell, and a short, broad abdomen folded under its thorax. Several similar animals, such as the crab louse, or the hermit crab[?], are also called crabs.

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A crab is any of various machines used to hoist heavy objects.

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A crab is a person with a sour[?] disposition[?]. A crab generally complains[?] a great deal.