勒紧的英文：
tighten

Tighten one's belt (eat less food,spend less money,etc)
勒紧腰带(省吃俭用)

He reined in to a jog.
他勒紧马缰绳使马缓步前进。

When father lost his job we had to tighten our belts
父亲失了业,我们不得不勒紧裤腰带过日子。

They have tightened security along the border.
他们加强了边境的安全工作。

tighten or fasten by means of screwing motions.
通过连接动作来使变紧或扣紧。

Always counter with a wrench when tightening.
拧紧时，务必用扳手顶住。

The rebels are tightening the noose around the capital.
叛乱分子正在收紧对首都的包围。

Make body tighten, loose fat and improve metabolism.
消除多余脂肪，结实肌肤，加强身体新陈代谢。