Definition of "Crab" :

noun: a stroke of the oar that either misses the water or digs too deeply

"He caught a crab and lost the race."

noun: decapod having eyes on short stalks and a broad flattened carapace with a small abdomen folded under the thorax and pincers

noun: a louse that infests the pubic region of the human body

noun: the edible flesh of any of various crabs

noun: the fourth sign of the zodiac; the sun is in this sign from about June 21 to July 22

noun: (astrology) a person who is born while the sun is in Cancer

noun: a quarrelsome grouch

verb: complain

verb: fish for crab

verb: scurry sideways like a crab

verb: direct (an aircraft) into a crosswind