second-class
second-class (1) {adj.}
1. Belonging in the class that is next to the highest or next best.
He was only a second-class math student.
His parents traveled as second-class passengers on the boat.
The periodical came as second-class mail.
2. Not so good as others; second-rate.
They were never given full democratic rights but were always treated as second-class citizens.
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Source: A Dictionary of American Idioms
