To set in

Related to To set in: smart set, put into motion, sets in motion
To begin; to enter upon a particular state; as, winter set in early.
To settle one's self; to become established
To flow toward the shore; - said of the tide.
- Addison.

See also: Set, Set, Set

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.