One of the mysteries of the English language finally explained.
A large North American cyprinid fish, Ptychocheilus lucius, which is native to the Colorado River basin (where it is now rare), having an elongated head and body and an olive green back. [This name is now often considered offensive.]
1940s; earliest use found in Louis S. Caine (b. 1896).
In this article we explore how to impress employers with a spot-on CV.