Definitions
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noun 
  1. A crustacean of the infraorder Brachyura, having five pairs of legs, the foremost of which are in the form of claws, and a carapace.
  2. A bad-tempered person.
  3. (context, in plural crabs, informal) An infestation of pubic lice.
  4. (slang) A playing card with the rank of three.
verb (crabs, crabbing, crabbed)
  1. (intransitive) To fish for crabs.
  2. (intransitive) To complain.
  3. (intransitive) (by analogy with the movement of a crab) Of an aircraft, such as a glider, to move sideways.
  4. (transitive) (by analogy with the movement of a crab) To navigate (an aircraft, e.g., a glider) sideways against an air current in order to maintain a straight-line course.
  5. (context, obsolete) In World War 1, 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.
  6. (rare) To back out of something.

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