They kept it quiet that he was dead.

他们对他的死保密。

youdao

People say I should have kept it quiet.

人们说我应该不把事情说出来。

youdao

I've decided to resign but I'd rather you kept quiet about it.

我已决定辞职，但希望你不要声张出去。

《牛津词典》

I was afterwards told and he ordered that I be kept abed, that I be kept quiet, that my very life depended upon it.

之后觉察到医生来了，A，doctor，was，called—,他要我躺在床上，静养，不然性命不保。

耶鲁公开课 - 1945年后的美国小说课程节选

But instead of reporting all of the problems to the FDA, as required, the company initially kept it quiet.

FORBES: Magazine Article

Triopetra's relative inaccessibility and tiny size have kept it blissfully quiet.

BBC: Seductive southern Crete

The Bush administration allowed Argentina to devalue its currency and break contracts, all under the watchful eye of the IMF, while it kept quiet about a policy option that could have spared Argentina, Latin America and the world of the worst effects of such drastic steps.

FORBES: D.C. Chess Playing In 2001 Gave Us The Argentine Crisis In 2012