stiffen
verb (used with object)
to make stiff.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
A northeasterly wind had been stiffening the mud of the morning's thaw into a rigid record of that day's wayfaring on the Baskingridge road.
From Thankful Blossom by Bret Harte