red linenoun [ C ]
uk/ˌred ˈlaɪn//ˌred ˈlaɪn/a limit beyond which someone's behaviour is no longer acceptable:
The pirates had crossed a red line, and there would be no giving in to their demands.
英语词典包含110679条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。