minor league
US /ˌmaɪnər ˈliːɡ/
UK /ˌmaɪnər ˈliːɡ/

1.
a professional sports league that is not at the highest level of competition
:
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He spent several years playing in the minor league before making it to the majors.
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Many promising young players start their careers in the minor league.
2.
of lesser importance, significance, or quality
:
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His contributions to the project were strictly minor league.
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Compared to the main event, this side show is pretty minor league.
1.
not important or serious; of low quality or standard
:
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His acting in the play was pretty minor league.
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Don't bother with that restaurant; it's totally minor league.