red belt
/ˌrɛd ˈbɛlt/noun
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.
Origin
1920s. From red + belt.
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