Definitions

1. verb

to become or make something stiff or less flexible

“The cold weather stiffened my muscles.”

2. verb

to increase or make something more severe or more rigid

“The news stiffened public opinion against the government.”

3. verb

to make or become more proud or obstinate

“After being criticized, she stiffened her resolve.”

4. verb

to make or become more rigid or inflexible in one’s opinions or attitude

“The politician’s stance stiffened in the face of criticism.”