think for yourself
US /θɪŋk fɔːr jʊərˈself/
UK /θɪŋk fɔːr jʊərˈself/
1.
to form your own opinions and make your own decisions, rather than simply accepting what others say or do
:
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It's important to think for yourself and not just follow the crowd.
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My parents always encouraged me to think for myself.