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stiffen

stiff·en

stiffen

 
pronunciation:
stI fn
part of speech: transitive verb & intransitive verb
inflections: stiffened, stiffening, stiffens
definition: to make or become stiff or stiffer.
The icing will stiffen if you put the cake in the refrigerator.
antonyms:
liquefy, relax, soften, weaken
similar words:
set
derivation: stiffener (n.)