set in
phrasal verbPart ofset
set in — phrasal verb
1. if something unpleasant — bad weather, infection, panic, sadness — sets in, it b
1.phrasal verb
Definition
if something unpleasant — bad weather, infection, panic, sadness — sets in, it begins and is likely to continue for a while.
Example
Heavy snow set in just as the climbers reached the mountain hut.
Boredom set in after the third hour of waiting at the airport.