turning point
US /ˈtɜːrnɪŋ pɔɪnt/
UK /ˈtɜːrnɪŋ pɔɪnt/
1.
a time at which a decisive change in a situation occurs, especially one with important consequences
:
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The invention of the internet was a turning point in human history.
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His decision to move abroad marked a significant turning point in his life.