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Definition of red line noun from the Oxford Advanced Learner's Dictionary

red line

noun
 
/ˌred ˈlaɪn/
 
/ˌred ˈlaɪn/
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  1. an issue or a demand that one person or group refuses to change their opinion about during a disagreement or negotiations
    • The issue of sovereignty is a red line that cannot be crossed.
    Topics Discussion and agreementc2
previously
adverb
 
 
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