◆to turn sth inside out or to turn sth upside down
(search thoroughly)彻底搜查…；把…翻个底朝天
They hadn't found a scrap of evidence though they had turned his flat inside out.尽管他们把他的公寓翻了个底朝天, 却一丝证据都没发现。
(change completely)彻底改变；完全搅乱
His world had been turned upside down.他的世界完全被打乱了。