have one's wits about one

Also, keep one's wits about one. Remain alert or calm, especially in a crisis. For example, After the collision I had my wits about me and got his name and license number, or Being followed was terrifying, but Kate kept her wits about her and got home safely. [Early 1600s]

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Example Sentences

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One learns to keep cool, and to have one's wits about one; for anyone who loses his temper has but a poor chance indeed against another who keeps cool.