any chiefly marine decapod crustacean of the genus Cancer and related genera (section Brachyura), having a broad flattened carapace covering the cephalothorax, beneath which is folded the abdomen. The first pair of limbs are modified as pincers

any of various similar or related arthropods, such as the hermit crab and horseshoe crab

a manoeuvre in which an aircraft flies slightly into the crosswind to compensate for drift

a mechanical lifting device, esp the travelling hoist of a gantry crane

to hunt or catch crabs

to fly (an aircraft) slightly into a crosswind to compensate for drift

to move forwards with a slight sideways motion, as to overcome an offsetting current

to move sideways

to find fault; grumble

to spoil (esp in the phrase crab someone's act)

an irritable person