Bush-league meaning

A minor league.
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Of or belonging to a minor league.
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Of inferior or unprofessional quality; second-rate.

A bush-league advertising campaign.

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Any small or second-rate sphere of activity, etc.
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(chiefly US, idiomatic) A professional sports association at the lower levels of minor league organization.
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(figuratively, by extension) A low-ranking or inferior level among groups, professions, organizations, etc.
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Having inferior quality.
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Amateurish.
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