Verb

auf|heizen

to heat up, to warm up, to preheat, to stir up

Ich heize die Suppe auf.

I'm heating up the soup.

Die Sonne heizt den Raum auf.

The sun is heating up the room.

Die Debatte heizte die Stimmung auf.

The debate heated up the atmosphere.

((sth.)) ((aufheizen)) to heat sth. up Can you heat up the milk?

erwärmen (to warm up), erhitzen (to heat up)

From 'auf-' (up) and 'heizen' (to heat). Literally means 'to heat up'.

Think of turning the heat 'up' ('auf') to 'heat' ('heizen') something, like leftovers or an oven.

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