baseball fever; enthusiasm for baseball
Refers to a strong passion or craze for baseball, often used when someone is deeply absorbed in the sport.
He is consumed by baseball fever and practices every day.
When the World Series season comes around, the whole city is gripped by baseball fever.
Compound of 野球 (baseball) and 熱 (fever, passion). The exact origin is uncertain, but it follows a common pattern of attaching 熱 to a noun to indicate a craze or intense enthusiasm.