keep your shirt on
US /kiːp jʊər ʃɜːrt ɑːn/
UK /kiːp jʊər ʃɜːrt ɑːn/

1.
stare calmo, non arrabbiarsi
to tell someone to calm down or not to get angry
:
•
Just keep your shirt on, we'll get there eventually.
Stai calmo, ci arriveremo alla fine.
•
Hey, keep your shirt on! There's no need to yell.
Ehi, stai calmo! Non c'è bisogno di urlare.