It had been a long day and the children were beginning to flag.

这一天真漫长，孩子们都累得打起蔫来。

《牛津词典》

Halfway through the race he began to flag.

赛跑到一半他开始有点跑不动了。

youdao

Soaking wet, she decided to flag down the next car.

她浑身湿透，准备招手拦下一辆车。

youdao

Brown was furious that the crowd outside had refused to honor his white flag of truce earlier in the day.

VOA: special.2009.06.25

If you would like to flag them as private, because you just don't want your classmates to see what you're asking, you can certainly do that.

如果你想要把它们标志为私有的，不想让你的同学们,看到你问的问题，你当然也可以这样做。

哈佛公开课 - 计算机科学课程节选

But it's worth taking a moment to flag the fact that there are people, there are philosophers, who think we can generalize across all humans.

但是值得一提的是，有些人，有些哲学家，认为我们可以把所有人进行归类。

耶鲁公开课 - 死亡课程节选

We have the ability for our community members to flag abuse, and we have 250 moderators.

CNN: With new mobile apps, no one's a stranger

One, because of the state and local government cutback, the recovery is starting to flag.

WHITEHOUSE: President Obama Meets with Economic Recovery Advisory Board | The White House

They distinguish themselves from the other unionists by their opposition to flag waving and unity candidates.

BBC: It's a love 'n hate thing for the new gang of two