drift apart
US /drɪft əˈpɑːrt/
UK /drɪft əˈpɑːrt/

1.
疏远, 渐行渐远
If two people drift apart, they gradually become less friendly and their relationship ends.
:
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After college, we started to drift apart.
大学毕业后,我们开始疏远了。
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It's sad when good friends drift apart.
好朋友疏远了真让人难过。