to use something such as authority, power, influence, etc. in order to make something happen

If you were to exert your influence they might change their decision. 如果你能施加你的影响，他们或许会改变决定。

Some managers exert considerable pressure on their staff to work extra hours without being paid. 一些老板向员工施加巨大的压力迫使他们无偿加班。

to make a mental or physical effort

I was too tired to exert myself. 我太累了，心有余而力不足。

Try not to exert yourself while you are recovering - it could set you back.

Apart from the odd yoga class, he doesn't really exert himself much.

As soon as we stop exerting ourselves, our heart rate should return to normal.

She had a nap after lunch every day, even if she had not exerted herself at all.