'He has just lost hold of common sense'.

“他刚刚失去了常识” 。

The opposite is " to fall apart, " or, " to lose hold of yourself."

反义词是“分崩离析” 或“失去控制” 。

The infant’s parents told a local journalist that they lost hold of their child in the strong winds and flood waters.

失踪婴儿的父母在接受记者采访时称，因为强风和洪水他们的孩子失踪了。

At a certain point, however, Bourgoin seemed to have lost his bearings, to have lost hold of what was true and what was not.

然而，在某一点上，Bourgoin 似乎失去了方向，失去了对真实和虚假的把握。