Wiktionary:Word of the day/2020/April 21

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trial balloon n

(aeronautics, historical) A small balloon released into the sky to determine the direction and tendency of winds in the upper air before a manned ascent in a larger balloon; a ballon d'essai. (idiomatic, figuratively) 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.

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