1856, in the meaning defined above
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fill someone's shoes
fill the gaps
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“Fill out.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fill%20out. Accessed 3 Mar. 2021.
More from Merriam-Webster on fill out
Nglish: Translation of fill out for Spanish Speakers
Britannica English: Translation of fill out for Arabic Speakers
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