Definition of set in in US English:

set in

phrasal verb

  • (of something unpleasant or unwelcome) begin and seem likely to continue.

    ‘less hardy plants should be brought inside before cold weather sets in’
    • ‘As cooler weather sets in over autumn and winter the plants die down and become dormant.’
    • ‘Before the cold weather sets in, have your central heating serviced to ensure you keep your energy bills down.’
    • ‘It takes a very focused mind indeed to do this without listener boredom setting in.’
    • ‘Surgeons have to remove damaged skin quickly and replace it to prevent infection from setting in.’
    • ‘As the boats were being lowered the Tuscania took on a list to starboard and panic began to set in.’
    • ‘There must be a commitment to continuous improvement, otherwise complacency sets in.’
    • ‘In the past she has shown she is not easily cowed, but she said a deep fatigue was setting in.’
    • ‘If the battery is healthy, it is a good idea to check the terminals and smear them with petroleum jelly to stop corrosion setting in.’
    • ‘But to get the real benefits of cheaper gas and electricity as the cold weather sets in, it is best to act now.’
    • ‘According to his research, people feel that middle age begins at 49 and old age sets in at 65.’
    begin, start, arrive, come, develop, become established, get under way, settle in
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