There are 2 definitions of set in in English:

set in1

(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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Word of the day meretricious
Pronunciation: ˌmɛrɪˈtrɪʃəs
adjective
apparently attractive but having no real value...

There are 2 definitions of set in in English:

set-in2

Syllabification: set-in

adjective

[attributive]
(Of a sleeve) made separately and inset into a garment.
More example sentences
  • If the armhole is too high and the garment has a set-in sleeve, the fit can be adjusted as you sew.
  • Shoulder width is particularly important in fitted garments with set-in sleeves.
  • Other typical details include double-entry cargo pockets and set-in sleeves.

Definition of set in in: