set in

Từ điển tiếng Anh - Cambridge Advanced Learners Dictionary

set in phrasal verb [ setting in sets in ]
When something unpleasant sets in, it begins and seems likely to continue in a serious way
• This rain looks as if it has set in for the rest of the day.
• If you get bitten by a dog, you have to make sure the wound is properly cleaned, or an infection could set in.
• Despair seems to have set in among the team.
Thesaurus⁺: ↑Starting and beginning ↑Starting again
Main entry: set_{phrasal verb}