fill out

verb

filled out; filling out; fills out

intransitive verb

: to put on flesh

Word History

First Known Use

1856, in the meaning defined above

Time Traveler

The first known use of fill out was in 1856

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Browse Nearby Words

Fillon

fill out

fillowite

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Cite this Entry

Style

“Fill out.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fill%20out. Accessed 30 Jul. 2025.

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Kids Definition

fill out

verb

1

: to put on flesh

2

: to complete by filling in blanks

fill out an application

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