variants:
US color line
or British colour line
plural color lines
Definition of color line
: a set of societal or legal barriers that segregates people of color from white people (as by restricting social interaction or requiring separate facilities) and prevents people of color from exercising the same rights and accessing the same opportunities as white people
—usually used with the His father … had grown up in California with Jackie Robinson, who broke the color line in Major League Baseball.— Maureen O'Donnell
— called also color bar
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Merriam-Webster unabridged
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Time Traveler for color line
The first known use of color line was in 1874
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