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(争论或谈判中)拒绝改变立场的问题(或要求)
    • The issue of sovereignty is a red line that cannot be crossed.主权问题是一条不能跨越的红线。🔊🔊
    Topics Discussion and agreementc2