Dictionary definition · fill out
verb
- write all the required information onto a form"fill out this questionnaire, please!"
- make bigger or better or more complete
- supplement what is thought to be deficient"He eked out his meager pay by giving private lessons"
- line or stuff with soft material"pad a bra"
- make fat or plump"We will plump out that poor starving child"
- become round, plump, or shapely"The young woman is fleshing out"
Source: Open English WordNet (CC BY 4.0).