
ausmalen
to paint
To paint the walls and ceilings of a room or building.
Wir lassen nächste Woche die ganze Wohnung neu ausmalen.
We're having the whole apartment repainted next week.
to paint / to color in / to imagine
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to paint
To paint the walls and ceilings of a room or building.
Wir lassen nächste Woche die ganze Wohnung neu ausmalen.
We're having the whole apartment repainted next week.

to imagine
To imagine something vividly and in detail, often with a negative or dramatic expectation.
Ich möchte mir gar nicht ausmalen, was ohne deine Hilfe passiert wäre.
I don't even want to imagine what would have happened without your help.

to color in
To fill a drawing, a template, or an area with color.
Die Kinder malen gerne die Bilder in ihren Malbüchern aus.
The children like coloring in the pictures in their coloring books.
'Ausmalen' (to paint / to color in / to imagine) is a separable verb. The prefix 'aus-' goes to the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Er malt sich die schlimmsten Szenarien aus.
He imagines the worst scenarios.
In the meaning 'sich etwas ausmalen' (to imagine something), the verb is reflexive and is used with a dative pronoun: 'sich (mir, dir, ihm...) etwas ausmalen' (to imagine something for oneself). What one imagines is in the accusative.
Kannst du dir ausmalen, wie glücklich sie sein wird?
Can you imagine how happy she will be?
The expression 'sich etwas ausmalen' (to imagine something) is very often used in negative sentences or questions to express that one would rather not imagine a terrible situation.
Mal dir bloß nicht aus, was alles hätte schiefgehen können!
Don't even imagine all the things that could have gone wrong!
The two concrete meanings can be distinguished by the object. If 'ausmalen' refers to large surfaces such as 'Zimmer' (room), 'Wohnung' (apartment), or 'Haus' (house), it means painting. If it refers to 'Bild' (picture) or 'Zeichnung' (drawing), it means filling it with color.
Wir müssen die Küche neu ausmalen.
We need to repaint the kitchen.
to paint / to cancel
Streichen is the usual term for covering a single wall or another surface with paint. In this context, ausmalen usually means painting the walls and ceilings of an entire room or building.

Am Samstag malen wir das ganze Wohnzimmer neu aus.
On Saturday, we’re repainting the entire living room.
Am Samstag streichen wir die Wand hinter dem Sofa blau.
On Saturday, we’re painting the wall behind the sofa blue.