set in
verb- To take root, become established. · That was the point at which the rot set in.
From the library
28 was situated at the extremity of the village; during the drive night had set in, and darkness gave the surroundings the artificial appearance of a scene on the stage.
Not many days later, winter set in again with renewed frost and cold.
A violent fever suddenly set in, from which he died not many days later.
When the thaw set in, he led them all out to feed, and the Wild Goats scampered away as fast as they could to the mountains.
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