verb
to fill out, to fill in
A1
ausfüllen: to fill out/ fill in (a form). Separable verb (fill + out), present separates: du füllst das Formular aus. Auxiliary haben; participle ausgefüllt. Regular weak verb (regular conjugation). Non-reflexive. Common collocation: 'ein Formular ausfüllen'. Imperative: 'Fülle aus!' (du). Sie form: 'Füllen Sie aus!'
Examples
Bitte füllen Sie das Formular aus.
Please fill out the form.
Sie hat den Antrag ausgefüllt.
She filled out the application.
Er füllte das Kreuzworträtsel aus.
He filled in the crossword puzzle.
Details
Mnemonics
Imagine pouring information into the empty boxes of a form until they are 'filled out'.
Think 'out' + 'fill' — 'aus' sounds like English 'out', so 'ausfüllen' = 'fill out'.
Notes
A separable verb: in main clauses the prefix 'aus' separates and goes to the end (ich fülle das Formular aus). In perfect tenses the past participle stays together (hat ausgefüllt). It is a regular (weak) verb and uses 'haben' as auxiliary.