A crustacean of the infraorder Brachyura, having five pairs of legs, the foremost of which are in the form of claws, and a carapace.

(uncountable) The meat of this crustacean, served as food; crabmeat.

A bad-tempered person.

(in plural crabs, informal) An infestation of pubic lice (Pthirus pubis).

(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.

(uncountable, aviation) The state of an aircraft's nose being pointed upwind of its groundtrack to compensate for crosswinds during an approach to landing.

(slang) A playing card with the rank of three.

(rowing) A position in rowing where the oar is pushed under the rigger by the force of the water.

A defect in an outwardly normal object that may render it inconvenient and troublesome to use.

The crab apple or wild apple.

The tree bearing crab apples, which has a dogbane-like bitter bark with medical use.

A cudgel made of the wood of the crab tree; a crabstick.

A movable winch or windlass with powerful gearing, used with derricks, etc.

A form of windlass, or geared capstan, for hauling ships into dock, etc.

A machine used in ropewalks to stretch the yarn.

A claw for anchoring a portable machine.

The tree species Carapa guianensis, native to South America.

(informal) Short for carabiner.

(intransitive) To fish for crabs.

(transitive, US, slang) To ruin.

(intransitive) To complain.

(transitive) To complain about.

(intransitive) To drift or move sideways or to leeward .

To move in a manner that involves keeping low and clinging to surfaces.

(transitive, aviation) To navigate (an aircraft, e.g. a glider) sideways against an air current in order to maintain a straight-line course.

(transitive, film, television) To move (a camera) sideways.

(rare) To back out of something.

To be ill-tempered; to complain or find fault.