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Longman Dictionary of Contemporary English
colour bar
noun
EXAMPLES FROM CORPUS
▪ I wonder if there could have been a colour bar in operation around here, because our school was completely white.
▪ Joe Louis had broken the colour bar.
▪ There is a colour bar, that is for certain.
Wiktionary
colour bar

n. 1 The segregation of people of different colour or race, especially any barrier to black people participating in activities with white people. 2 (context printing English) A pattern of varying tonal density that enables visual and numeric comparisons to be made across multiple printed sheets or pages.

WordNet
colour bar

n. barrier preventing blacks from participating in various activities with whites [syn: color bar, color line, colour line, Jim Crow]

Usage examples of "colour bar".

Is that because you have not found a single capable black, or is it because your job reservation policy and your strict colour bar prevent any black, no matter how good--' He was driven back inexorably until in anger he went on the offensive.

Probably never very strong, the colour bar in Trenarth had collapsed entirely with the influx of large numbers of coloured Americans.

He took care not to show it, though, which wasn't difficult, since Brown prosed on at length, telling him that when they'd been in Chicago, and a hotel had refused to take the coloured people who were along with him, Brown and his gang had trooped out en masse, and hadn't rested until they'd found a place where there was no colour bar.

If I'd known all this, and the interesting facts that Indians have no colour bar and that Apache girls are given a pretty free choice of husbands, I might have breathed easier, but I doubt it.

Delta had built a chain of plastic paradises in Mexico, eradicating all trace of local colour bar the tequila, in order that American tourists could escape American winters without forsaking Pizza Hut, Mickey-D's or ESPN.

At the beginning of Teddall's ministry there had been threats of a mammoth, combined, anti-Vietnam war, anti-colour bar, anti-colonialism demonstration.