
aufbringen
to raise
To obtain or provide needed financial means or resources.
Die Gemeinde muss eine hohe Summe aufbringen, um die Schule zu sanieren.
The municipality has to raise a large sum to renovate the school.
to raise / upset
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to raise
To obtain or provide needed financial means or resources.
Die Gemeinde muss eine hohe Summe aufbringen, um die Schule zu sanieren.
The municipality has to raise a large sum to renovate the school.

to upset
To make someone angry or annoyed.
Seine ständige Kritik bringt mich langsam wirklich auf.
His constant criticism is slowly really upsetting me.

to open
To open a locked door, a lock, or a container, often with effort or force.
Der Schlüsseldienst konnte die zugefallene Tür schnell wieder aufbringen.
The locksmith was quickly able to open the door that had slammed shut.

to apply
To apply a layer of a material, such as paint, varnish, or cream, to a surface.
Nach der Grundierung wird der Maler morgen die finale Farbschicht aufbringen.
After the primer, the painter will apply the final coat of paint tomorrow.
'Aufbringen' is a separable verb. The prefix 'auf' comes at the end in a main clause, stays attached to the verb in a subordinate clause, and in the infinitive 'zu' comes between them.
Er bringt die nötige Geduld für dieses Projekt auf.
He musters the necessary patience for this project.
The meaning of 'aufbringen' is best recognized by its object. If it is money or means, it is about obtaining or raising something. If the object is a person, it is about anger. With a door, it is about opening, and with paint, it is about applying.
Die Firma konnte die finanziellen Mittel nicht mehr aufbringen.
The company could no longer raise the financial means.
In this meaning, 'aufbringen' is often combined with abstract resources. Typical phrases are: 'Geld aufbringen' (to raise money), 'die Kosten aufbringen' (to cover the costs), 'Geduld aufbringen' (to muster patience), or 'Verständnis aufbringen' (to show understanding).
Ich kann für sein Verhalten kein Verständnis aufbringen.
I can't show any understanding for his behavior.
When 'aufbringen' means 'ärgern' (to annoy/upset), the person who becomes angry is always the accusative object of the sentence. The thing or person causing the anger is the subject.
Diese Ungerechtigkeit bringt mich wirklich auf.
This injustice really upsets me.
to apply / assign
Aufbringen and auftragen can both mean spreading a layer over a surface. Auftragen is the usual standard choice for this. Aufbringen often sounds more technical or places greater emphasis on the completed layer, for example a protective coating in a work instruction.

Die Fachanweisung verlangt, eine dünne Schutzschicht auf das Metall aufzubringen.
The technical instructions require applying a thin protective coating to the metal.
Der Maler trägt eine dünne Schutzschicht gleichmäßig auf das Metall auf.
The painter applies a thin protective coating evenly to the metal.