The Collaborative International Dictionary of English v.0.48:
Crabbing \Crab"bing\, n. 1. The act or art of catching crabs. [1913 Webster] 2. (Falconry) The fighting of hawks with each other. [1913 Webster] 3. (Woolen Manuf.) A process of scouring cloth between rolls in a machine. [1913 Webster]