lose it

He said he then came across assistant headteacher Morgan Davis with the defendant and overheard the boy saying 'I told you, I knew it, I lost it'.

There is an old ethos of "use it or lose it" that may apply to cognitive tasks as well.

After one “Exorcist”-like incident, I lost it.

“I really think he lost it a long time ago,” a pool reporter said.

������ it really bought me was independence - and in a way, losing it is like losing a friend.