What is the meaning of crab?

noun

• Decapod having eyes on short stalks and a broad flattened carapace with a small abdomen folded under the thorax and pincers.
• A quarrelsome grouch.
  • synonyms: crabby person
• Astrology) a person who is born while the sun is in Cancer.
  • synonyms: Cancer
• The fourth sign of the zodiac; the sun is in this sign from about June 21 to July 22.
  • synonyms: Cancer, Cancer the Crab
• The edible flesh of any of various crabs.
  • synonyms: crabmeat
• A louse that infests the pubic region of the human body.
  • synonyms: crab louse, pubic louse, Phthirius pubis
• A stroke of the oar that either misses the water or digs too deeply.
  • usage: "he caught a crab and lost the race"

verb

• Direct (an aircraft) into a crosswind.
• Scurry sideways like a crab.
• Fish for crab.
• Complain.
  • usage: "What was he hollering about"
  • synonyms: gripe, bitch, grouse, beef, squawk, bellyache, holler