This is the 13969th most frequent German word.
füllen
To fill.
'füllen' is used here to describe the action of pouring a substance into a container until it is full.
Ich fülle das Glas mit Wasser.
I fill the glass with water.
'füllen' is used here in a phrasal sense ('ausfüllen'), referring to completing a document by writing necessary information.
Fülle bitte das Formular aus.
Please fill out the form.
'füllen' is used in a metaphorical sense, describing the permeation of a space with something intangible, like a scent.