carp

Concise Oxford English Dictionary © 2008 Oxford University Press:
carp1

▶noun (pl. same) a deep-bodied freshwater fish, often kept in ponds and sometimes farmed for food. [Cyprinus carpio and other species, family Cyprinidae.]

– origin ME: from OFr. carpe, from late L. carpa.

Concise Oxford English Dictionary © 2008 Oxford University Press:
carp2

▶verb complain or find fault continually.

– derivatives
carper noun.

– origin ME (in the sense ‘talk, chatter’): from ON karpa ‘brag’; later influenced by L. carpere ‘pluck at, slander’.