pigeon

Concise Oxford English Dictionary © 2008 Oxford University Press:
pigeon1

▶noun

• 1 a stout seed- or fruit-eating bird with a small head, short legs, and a cooing voice, similar to but generally larger than a dove. [Family Columbidae: many species.]

• 2 informal, chiefly N. Amer. a gullible person, especially the victim of a confidence trick.

– origin ME: from OFr. pijon, ‘young bird’, from an alt. of late L. pipio(n-), ‘young cheeping bird’ of imitative origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
pigeon2

▶noun

• 1 archaic spelling of pidgin.

• 2 (one's pigeon) Brit. informal one's particular responsibility or business.