What is the meaning of Crab?

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

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

Various other animals that resemble true crabs:

1. Any of various crustacean in the infraorder Anomura, usually excluding squat lobsters.

   Any of various crustacean in the infraorder Anomura, usually excluding squat lobsters.

   A horseshoe crab.

   A bad-tempered person.

   An infestation of pubic lice (Pthirus pubis).

   Ellipsis of crab angle.

   A playing card with the rank of three.

   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.

   An unsold book that is returned to the publisher.

   On an insignia, a coat of arms symbol representing a senior rank.

   To fish for crabs.

   To ruin.

   To complain.

   To complain about.

   To drift or move sideways or to leeward .

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

   To move (a camera) sideways.

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

   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.

   To back out of something.

   To make a loud, rapid rattling sound when scared, stressed, or agitated.

   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.

   To irritate, make surly or sour

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

   To cudgel or beat, as with a crabstick

   To offend or insult.

   The tree species Carapa guianensis, native to South America.

   Clipping of carabiner, modified based on likening the shape of a carabiner to a crab's claw.

   alternative form of crabbe (“crab”)

   alternative form of crabbe (“crabapple”)

   crab

   Source: wiktionary.org