Definition of set in in English:

set in

(Of something unpleasant or unwelcome) begin and seem likely to continue: less hardy plants should be brought inside before cold weather sets in
More example sentences
  • Before the cold weather sets in, have your central heating serviced to ensure you keep your energy bills down.
  • But to get the real benefits of cheaper gas and electricity as the cold weather sets in, it is best to act now.
  • As the boats were being lowered the Tuscania took on a list to starboard and panic began to set in.
Synonyms
begin, start, arrive, come, develop
See parent entry: set

Definition of set in in:

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