SET IN


Meaning of SET IN in English

set in phrasal verb ( see also ↑ set )

if something sets in, especially something unpleasant, it begins and seems likely to continue for a long time:

Winter seems to be setting in early this year.

Further economic decline set in during the 1930s.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.