have been stiffening
-he estado endureciendo
Present perfect progressiveconjugation ofstiffen.There are other translations for this conjugation.

stiffen

We do not have example sentences for have been stiffening in English. Please check your spelling or try searching for similar words or phrases. Click here to see a translation instead.
Other Dictionaries
Explore the meaning of stiffen in our family of products.
Word of the Day
to boo