Webster's English Dictionary

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crab

1. crab \'krab\ n [ME crabbe, fr. OE crabba; akin to OHG krebiz crab, OE 
   ceo]rfan to carve - more at CARVE 1: any of numerous chiefly marine broadly 
   built crustaceans :  1a: any of a tribe (Brachyura) with a short broad usu. 
   flattened carapace,  a small abdomen that curls forward beneath the body, 
   short antennae, and the anterior pair of limbs modified as grasping pincers 
   1b: any of various other crustaceans resembling true crabs in the more or l 
   ess reduced condition of the abdomen 2: any of various machines for raising 
   or hauling heavy weights  3: failure to raise an oar clear of the water on 
   recovery of a stroke or mi ssing the water altogether when attempting a 
   stroke {catch a ~} 4: apparent sideways motion of an airplane headed into a 
   crosswind 
2. crab vb or crabbed;  or crab.bing 1: to cause to move sideways or in an 
   indirect or diagonal manner; spec if : to head (an airplane) by means of 
   the rudder into a crosswind to counteract drift 2: to subject to crabbing  
   1a1: to move sideways indirectly or diagonally  1a2: to crab an airplane  
   1b: to scuttle or scurry sideways like a crab  2: to fish for crabs  - 
   crab.ber n
3. crab n [ME crabbe, perh. fr. crabbe 1crab] : CRABSTICK 
4. crab vb or crabbed;  or crab.bing [ME crabben, prob. back-formation fr. 
   crabbed] 1: to make sullen : SOUR  2: to complain about peevishly  3: 
   SPOIL, RUIN  : CARP, GROUSE  - crab.ber n
5. crab n : a sour ill-tempered person : CROSSPATCH