fill out
A2 neutral separable both
In simple words
To write all the information needed on a form, or (of a person) to become less thin.
Literal meaning: To write in all the empty spaces until the form is full.
Meanings
1 A2 neutral
To enter all the required information on a form, application, or document.
"You'll need to fill out this form before you can see the doctor."
Grammar: separable
2 B2
idiomatic
informal
To become fuller or more rounded in body, especially during growth or after weight gain.
"He was quite slim as a teenager, but he's really filled out since then."
Grammar: inseparable
Usage notes
The dominant American English expression for completing a form. The intransitive sense (a person filling out = becoming less thin) is more informal and often refers to adolescents or people gaining healthy weight. The form-completion sense is neutral and extremely common.
Commonly used with
form application questionnaire survey paperwork profile
Forms
Base
fill out
I/you/we/they
3rd person
fills out
he/she/it
Past simple
filled out
yesterday
Past participle
filled out
have + pp
-ing form
filling out
continuous
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