to change one's way of thinking
Seine Denkweise, Einstellung oder Überzeugungen grundlegend ändern.
To fundamentally change one's beliefs or approach to life.
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Nach der Reise musste er völlig umdenken.— After the trip, he had to completely change his way of thinking.
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Wir müssen umdenken, um die Umwelt zu schützen.— We have to change our mindset to protect the environment.