Leave it unchurned and it’ll set in a solid block.
How he has escaped marriage until now I cannot tell: the number of caps set in his direction would furnish a warehouse. — Patrick O'Brian, "HMS Surprise".
They also bring to mind stylish movie sets in precolor Hollywood; Fred and Ginger or a phalanx of Busby Berkeley dancers could easily drift among their mirrored, ethereal forms.
Used in the Beginning of Sentence
Set in Amritsar, “Rab” reteams the director Aditya Chopra with Shahrukh Khan, Hindi cinema's reigning superstar, and the two deftly and winningly blend comedy and melodrama.
Meaning of setting in for the defined word.
Grammatically, this idiom "setting in" is a verb, more specifically, a verb form.