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V-ERG
抓緊;攥緊
If you tighten your grip on something, or if your grip tightens, you hold the thing more firmly or securely.
例句
Luke answered by tightening his grip on her shoulder...
盧克的回應就是把她的肩頭抓得更緊了。
Her arms tightened about his neck in gratitude...
她充滿感激，把他的脖子摟得更緊了。
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V-ERG
繃緊，拉緊(繩、鏈)
If you tighten a rope or chain, or if it tightens, it is stretched or pulled hard until it is straight.
例句
The anchorman flung his whole weight back, tightening the rope...
那個壓陣隊員使盡了全身力氣往后拽，把繩子拉得緊緊的。
The cables tightened and he was lifted gradually from the deck.
纜繩繃緊了，他被慢慢地吊離了甲板。
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V-ERG
(對…)嚴加控制;(使)加強控制
If a government or organization tightens its grip on a group of people or an activity, or if its grip tightens, it begins to have more control over it.
例句
He knows he has considerable support for his plans to tighten his grip on the machinery of central government...
他清楚有相當多的人支持他對中央政府機構加強控制的計劃。
As the regime's grip on the mainland tightened over the next few years, hundreds of thousands more people fled south.
隨著后來幾年那個政權加強對大陸的控制，又有數十萬人逃往南方。
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VERB
擰緊，旋緊(螺釘、螺絲帽等)
When you tighten a screw, nut, or other device, you turn it or move it so that it is more firmly in place or holds something more firmly.
例句
I used my thumbnail to tighten the screw on my lamp...
我用拇指指甲把臺燈上的螺釘擰緊了。
All the bolts were fully tightened.
所有的螺釘都擰緊了。
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VERB
(身體局部)變僵硬，產生憋悶感，產生阻塞感
If a part of your body tightens, the muscles in it become tense and stiff, for example because you are angry or afraid.
例句
Sofia's throat had tightened and she couldn't speak...
索菲婭喉嚨哽住了，說不出話來。
She saw his jaw tighten and his face lose its colour.
她看見他的下巴繃緊，臉色煞白。
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VERB
使(規定、政策、制度)更加嚴格；使更加有效
If someone in authority tightens a rule, a policy, or a system, they make it stricter or more efficient.
例句
The United States plans to tighten the economic sanctions currently in place...
美國計劃加大現有經濟制裁的力度。
They have tightened security along the border...
他們加強了邊境的安全工作。