One of the mysteries of the English language finally explained.
1An area of communist strength or electoral control within a democratic country, especially the outer suburbs of Paris.
2= Soviet bloc. rare (now historical).
3A belt marking the attainment of a certain degree of proficiency in judo and certain other martial arts; especially one denoting a high degree of mastery.
1920s. From red + belt.
red belt/ˌrɛd ˈbɛlt/
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