phrasal-verb
set in
雨や寒さなどの不快なものが始まり、続く可能性が高い場合
Meaning
when something unpleasant like rain or cold begins and seems likely to continue
Example
The cold season has **set in**, and we need to wear warm clothes.
寒い季節が**set in**し、私たちは暖かい服を着る必要があります。