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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.
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