IDIOM ►

minor league (player or team)

Meaning 1
a baseball player or team that is good, but not the best
Sentence 1
Dom DiMaggio played for the San Francisco Seals, a minor league team, before he went to the Boston Red Sox.
Meaning 2
a person, business or other entity that is not the most important
Sentence 2
The Blue Corporation is a minor league business. Go to the boss; Jerry is a minor league player.

Derivation

A minor league baseball team plays in small towns and cities. Minor leagues train baseball players for the major leagues.