WCO meaning in Sports ?

In American football, the West Coast offense is an offense that places a greater emphasis on passing than on running.

There are two similar but distinct offensive strategic systems that are commonly referred to as "West Coast offenses". Originally, the term referred to the Air Coryell system popularized by Don Coryell. Following a journalistic error, however, it now more commonly refers to the offensive system devised by Bill Walsh while he was the offensive coordinator of the Cincinnati Bengals. The offense is characterized by short, horizontal passing routes in lieu of running plays to "stretch out" defenses, opening up the potential for long runs or long passes. It was popularized when Walsh was the head coach of the San Francisco 49ers.