English

Definition of trial balloon noun from the Oxford Advanced Learner's Dictionary

 

trial balloon

 noun
noun
BrE
 
; NAmE
 
(especially North American English)
 
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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 1930s: from translation of French ballon d'essai.
See the Oxford Advanced American Dictionary entry: trial balloon