wits
WITS noun
[ plural ] uk/wɪts/ usintelligence and the ability to think quickly
сообразительность
keep/have your wits about you
to be ready to think quickly in a situation and react to things that you are not expecting
быть начеку
You have to keep your wits about you when you're cycling. Идиомыbe at your wits ' endscare/frighten sb out of their wits