stiffen
Definition
To become or make something become rigid or less flexible.
中文 变得或使某物变得坚硬或不那么灵活。
Example
"She stiffened her posture when the boss entered the room."
To become or make something become rigid or less flexible.
中文 变得或使某物变得坚硬或不那么灵活。
"She stiffened her posture when the boss entered the room."