"trial balloon : (idiomatic) An idea, suggestion, or prospective action, product, etc., offered to an..."

“trial balloon : (idiomatic) An idea, suggestion, or prospective action, product, etc., offered to an audience or group in order to test whether it generates acceptance or interest.
Today is World Creativity and Innovation Day, which is recognized by the United Nations to raise awareness about the importance of creativity and innovation in problem-solving to advance the UN’s Sustainable Development Goals.”

- https://en.wiktionary.org/wiki/trial_balloon#English

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