Keep (one's) wits about (one) phrase
To be able to think quickly and prepared to take necessary actions in an unpleasant or dangerous situation.
If I hadn't keep my wits about me when the gunman stormed into the room, I would have died.
By keeping his wits about him, John was able to rescue the kids from the burning bus.
I had got lost in the woods, but luckily I kept my wits about me and successfully found the way out.
The verb "keep" must be conjugated according to its tense.
The origin of this phrase is not clear.
To be quiet or stop making loud noises
Guys, when you do group work, please keep it down to a dull roar.