keep (all) your wits about you

US /kiːp ɔl jʊər wɪts əˈbaʊt ju/
UK /kiːp ɔl jʊər wɪts əˈbaʊt ju/
"keep (all) your wits about you" picture
1.

気を引き締める, 冷静に対処する

to stay alert and be able to think quickly in a difficult or dangerous situation

:
You need to keep all your wits about you when driving in heavy traffic.
交通量の多い場所を運転するときは、常に気を引き締めている必要があります。
It's a dangerous situation, so keep your wits about you.
危険な状況なので、気を引き締めてください。