stiffen
🇺🇸
/ˈstɪfn/
🇬🇧
/ˈstɪfn/
to make your body or part of it straight and still, often when angry or scared
When I heard the noise, I stiffened with fear.
to become or make something hard to bend or move
After sitting too long, my legs stiffen and ache.
to make an attitude or idea stronger; to become stronger
The criticism seemed to stiffen his determination to succeed.
to make something like cloth hard and unable to bend
The laundry starch will stiffen the fabric.