stiffen
Definition
To become or make something become rigid or less flexible.
Español Volverse o hacer que algo se vuelva rígido o menos flexible.
Example
"She stiffened her posture when the boss entered the room."
To become or make something become rigid or less flexible.
Español Volverse o hacer que algo se vuelva rígido o menos flexible.
"She stiffened her posture when the boss entered the room."