set in
US /set ɪn/
UK /set ɪn/
1.
When something unpleasant or difficult sets in, it begins and seems likely to continue.
:
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The rain set in for the entire weekend.
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Once the cold weather sets in, it's hard to get rid of it.
2.
If a belief or habit sets in, it becomes fixed and difficult to change.
:
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Once bad habits set in, they are hard to break.
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A feeling of despair set in after the news.