Tra từ trial balloon - Từ điển Oxford Advanced Learner 8th

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Từ điển Oxford Advanced Learner 8th

trial balloon ˈtrial balloon 7 BrE NAmE noun (especially NAmE) something that you say or do to find out what people think about a course of action before you take it •They may be floating a trial balloon to test reaction in the region. Word Origin: [trial balloon] 1930s: from translation of French ballon d'essai.