v.(尤指因气愤或害怕，使浑身或身体的一部分)变僵硬，变僵直，绷紧,(使)难以弯曲，难以活动，发僵,(使)变强硬，变坚定
stiffen的第三人称单数

原形：stiffen第三人称单数：stiffens过去式：stiffened过去分词：stiffened现在分词：stiffening

Mary stiffened with fear.
玛丽吓呆了。
Eric tried to stiffen his wavering soldiers.
埃里克企图使动摇的士兵坚定起来。
Mary stiffened when he grabbed her shoulder.
当他抓住她肩膀时，玛丽僵硬起来。
The cold weather made the ground stiffen, making it difficult to dig.
寒冷的天气使地面变硬，挖起来很困难。
After the accident, she tried to stiffen her resolve and move forward with her life.
事故发生后，她努力坚定决心，继续前行生活。
He took a deep breath to stiffen his nerves before giving the speech.
演讲前，他深吸一口气以增强勇气。
The company plans to stiffen its regulations on employee internet usage during work hours.
公司计划加强对员工工作时间使用互联网的规定。
Adding some starch can help stiffen the fabric, making it easier to work with.
添加一些淀粉可以使布料变得硬挺，更容易处理。
The news of the audit caused the management to stiffen their control over financial records.
审计的消息使得管理层加强对财务记录的控制。
A good stretch in the morning can help stiffen your muscles and prepare you for the day.
早晨的良好伸展可以帮助增强肌肉，为一天做好准备。（这里应该是“舒展”而非“增强”，stiffen 在此例中用得不准确）
The government announced measures to stiffen penalties for environmental violations.
政府宣布将加大对环境违法行为的处罚力度。
She applied a special lotion to stiffen the curls in her hair.
她涂抹了一种特殊的乳液来定型头发卷曲。
The coach's strict training regimen was designed to stiffen the team's discipline and improve performance.
教练严格的训练计划旨在加强队伍纪律，提高表现。