1. 蟹;螃蟹
A crab is a sea creature with a flat round body covered by a shell, and five pairs of legs with large claws on the front pair. Crabs usually move sideways.

1. a stroke of the oar that either misses the water or digs too deeply

e.g. he caught a crab and lost the race

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

3. a louse that infests the pubic region of the human body

Synonym: crab lousepubic lousePhthirius pubis

4. the edible flesh of any of various crabs

Synonym: crabmeat

5. a quarrelsome grouch

Synonym: crabby person