<p><strong>Noun</strong></p><ul><li>any decapod crustacean of the suborder Brachyura, having the eyes on short stalks and a short, broad, more or less flattened body, the abdomen being small and folded under the thorax.</li><li>any of various other crustaceans, as the hermit crab, or other animals, as the horseshoe crab, resembling the true crabs.</li><li>the zodiacal constellation or sign Cancer.</li><li>the Crab Nebula.</li><li>any of various mechanical contrivances for hoisting or pulling.</li><li>the maneuver of crabbing.</li><li>the crab louse.</li><li>a losing throw, as two aces, in the game of hazard.</li></ul><p><strong>Verb</strong></p><ul><li>to catch or attempt to catch crabs.</li><li>to move sideways, diagonally, or obliquely, especially with short, abrupt bursts of speed; scuttle.</li><li>(of an aircraft) to head partly into the wind to compensate for drift.</li><li>to drift or advance with some movement sideways, especially when under tow.</li><li>to move (a vehicle or object) sideways, diagonally, or obliquely, especially with short, abrupt movements.</li></ul>