keep your hair on
US /kiːp jʊər hɛər ɒn/
UK /kiːp jʊər hɛər ɒn/

1.
stare calmo, non arrabbiarsi
used to tell someone to calm down and not get angry or upset
:
•
Just keep your hair on, there's no need to get so worked up.
Stai calmo, non c'è bisogno di agitarsi così tanto.
•
Hey, keep your hair on! It was just a joke.
Ehi, stai calmo! Era solo uno scherzo.