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air up

transitive verb
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Definition of air up

informal
: to inflate or fill (something) with air We aired up the tires, gassed up the tanks, and drove on out of Monroe at noon.— John Dufresne, Requiem, Mass., 2008

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First Known Use of air up

1940, in the meaning defined above

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“Air up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/air%20up. Accessed 11 Apr. 2021.

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