to keep a cool head
In einer schwierigen oder stressigen Situation ruhig und besonnen reagieren, ohne die Kontrolle zu verlieren.
To remain calm and composed in a difficult situation.
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In der Krise muss man kaltes Blut bewahren.— In a crisis, one must keep a cool head.
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Er konnte trotz des Chaos kaltes Blut bewahren.— He was able to keep his cool despite the chaos.