Wiktionary:Word of the day/April 12

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push the envelope v

(intransitive, idiomatic, originally aeronautics) To go beyond established limits; to pioneer. Today is the International Day of Human Space Flight, which is recognized by the United Nations to celebrate the start of the space era, to reaffirm space science and technology’s contributions towards achieving sustainable development goals, and to emphasize the need to maintain outer space for peaceful purposes. It commemorates the first human space flight by the Soviet cosmonaut Yuri Gagarin, which took place on this day in 1961.

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