See also: setin
- To take root, become established.
- That was the point at which the rot set in.
- 1960 March, “The January blizzard in the North-East of Scotland”, in Trains Illustrated, page 137:
- By the afternoon it seemed as if the storm had passed and that frost was setting in; but in the evening the wind rose to gale force, bringing telegraph poles down like skittles and tangling power and telephone lines.