The ceiling suddenly caved in on top of them.

天花板突然塌落在他们身上。

《牛津词典》

Part of the roof has caved in.

部分屋顶已经坍塌了。

《柯林斯英汉双解大词典》

The foundations have sunk [caved in].

地基下陷。

《新英汉大辞典》

Those who gave up caved in to "the age of timidity, " says the 55-year-old engineer.

FORBES: Lonely Heart

So Sys-Con caved in, yanking the story and agreeing to forgo articles written by O'Gara.

FORBES: Who is Pamela Jones?

Instead, most suppliers have meekly caved in to their old-line distributors and refused to sell online.

FORBES: Not.coms