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 I.  noun 
 Usage: often attributive see:  carve  Date: before 12th century any of numerous chiefly marine broadly built decapod crustaceans:, any of an infraorder (Brachyura) with a short broad usually flattened carapace, a small abdomen that curls forward beneath the body, short antennae, and the anterior pair of limbs modified as grasping pincers, any of various crustaceans of an infraorder (Anomura) resembling true crabs in the more or less reduced condition of the abdomen,  cancer  1, infestation with crab lice, the angular difference between an aircraft's course and the heading necessary to make that course in the presence of a crosswind, 
 
 II.  verb (crabbed; crabbing)
 Date: 1657
 intransitive  verb to fish for crabs, 
 
 2. a. to move sideways indirectly or diagonally, to crab an airplane, to scuttle or scurry sideways, transitive  verb to cause to move sideways or in an indirect or diagonal manner, to subject to crabbing, crabber  noun 
 
 III.  noun 
 Etymology: Middle English crabbe, perhaps from crabbe 1crab
 Date: 14th century
  crab apple  , 
 
 IV.  noun 
 Date: 1580
 an ill-tempered person ;  grouch  , 
 
 V.  verb (crabbed; crabbing) 
 Etymology: Middle English crabben, probably back-formation from crabbed
 Date: 1662
 transitive  verb to make sullen ;  sour  , to complain about peevishly,  spoil  ,  ruin  , intransitive  verb  carp  ,  grouse  , crabber  noun 

 crab apple 
  noun 
 Etymology: 3crab
 Date: 1680
 any of various wild or cultivated trees (genus  Malus ) that are cultivars or relatives of the cultivated apple and that produce small sour fruit

 crab louse 
  noun 
 Date: 1547
 a sucking louse ( Phthirus pubis ) infesting the pubic region of the human body

 crab spider 
  noun 
 Date: 1861
 any of a family (Thomisidae) of spiders that resemble crabs in shape and in being able to walk forward, backward, and sideways