This is the 13246th most frequent German word.
aufwärmen
To warm up or reheat.
Reflexive verb usage to refer to physically warming oneself up.
Ich muss mich vor dem Training aufwärmen.
I need to warm up before the training.
Use of the verb in the passive voice to mean reheating a meal.
Das Essen sollte vor dem Servieren aufgewärmt werden.
The food should be warmed up before serving.
Metaphorical use referring to improving a relationship.