A minor league baseball player, or someone who plays or works in an unsophisticated or amateurish way.
From 'bush' (meaning remote or rural) plus '-er', originating from early 20th-century American baseball slang. Bush leagues were the minor leagues played in small towns away from major cities.
The term 'busher' actually started as sports slang but became a way to describe anyone who's inexperienced or shows poor judgment—a baseball term that conquered everyday English!
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