Gudgeon

Chamber's Twientieth Century Dictionary · 1908 · p. 46

guj′un, n. a genus of small, carp-like fishes common in the fresh waters of Europe—easily caught: a person easily cheated.— adj. foolish.— v.t. to impose on, cheat. [O. Fr. goujon —L. gobi on-em —Gr. kōbios . See Goby .]