lose your head
US /luːz jʊər hɛd/
UK /luːz jʊər hɛd/

1.
perdre la tête, s'énerver
to become very angry or excited and not behave in a calm, sensible way
:
•
When the fire alarm went off, everyone started to lose their head.
Quand l'alarme incendie a retenti, tout le monde a commencé à perdre la tête.
•
It's important to stay calm and not lose your head in a crisis.
Il est important de rester calme et de ne pas perdre la tête en cas de crise.