let up

减少, 减缓, 停止, 中止

例句与用法：

He refused to let up on the boy until his school grades improved.

直到那孩子学业有了进步他才肯放宽他对他的管束。

Let up for a minute. You can't work hard all day.

暂停一会儿，你不能整天都拼命工作。