Definitions from Wiktionary ( )

▸ noun:  A crustacean of the infraorder Brachyura, having five pairs of legs, the foremost of which are in the form of claws, and a carapace.
▸ noun:  (uncountable) The meat of this crustacean, served as food; crabmeat.
▸ noun:  A bad-tempered person.
▸ noun:  (in plural crabs, informal) An infestation of pubic lice (Pthirus pubis).
▸ noun:  (uncountable, aviation) The angle by which an aircraft's nose is pointed upwind of its groundtrack to compensate for crosswinds during an approach to landing; its crab angle.
▸ noun:  (poker slang) A playing card with the rank of three.
▸ noun:  (rowing) A position in rowing where the oar is pushed under the rigger by the force of the water.
▸ noun:  A defect in an outwardly normal object that may render it inconvenient and troublesome to use.
▸ noun:  (dated) An unsold book that is returned to the publisher.
▸ verb:  (intransitive) To fish for crabs.
▸ verb:  (transitive, US, slang) To ruin.
▸ verb:  (intransitive) To complain.
▸ verb:  (transitive) To complain about.
▸ verb:  (intransitive) To drift or move sideways or to leeward (by analogy with the movement of a crab).
▸ verb:  To move in a manner that involves keeping low and clinging to surfaces.
▸ verb:  (transitive, aviation) To navigate (an aircraft, e.g. a glider) sideways against an air current in order to maintain a straight-line course.
▸ verb:  (transitive, film, television) To move (a camera) sideways.
▸ verb:  (obsolete, World War I), to fly slightly off the straight-line course towards an enemy aircraft, as the machine guns on early aircraft did not allow firing through the propeller disk.
▸ verb:  (rare) To back out of something.
▸ noun:  The crab apple or wild apple.
▸ noun:  The tree bearing crab apples, which has a dogbane-like bitter bark with medical use.
▸ noun:  A cudgel made of the wood of the crab tree; a crabstick.
▸ noun:  A movable winch or windlass with powerful gearing, used with derricks, etc.
▸ noun:  A form of windlass, or geared capstan, for hauling ships into dock, etc.
▸ noun:  A machine used in ropewalks to stretch the yarn.
▸ noun:  A claw for anchoring a portable machine.
▸ verb:  (obsolete) To irritate, make surly or sour
▸ verb:  To be ill-tempered; to complain or find fault.
▸ verb:  (British dialect) To cudgel or beat, as with a crabstick
▸ noun:  The tree species Carapa guianensis, native to South America.
▸ noun:  (informal) Short for carabiner. [A metal link with a gate that can open and close, generally used for clipping ropes to anchors or other objects.]

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