stuffed shirt
US /stʌft ʃɜrt/
UK /stʌft ʃɜrt/

1.
collet monté, personne guindée
a pompous, formal, and often self-important person
:
•
He's such a stuffed shirt, always talking down to everyone.
C'est un tel collet monté, toujours à rabaisser tout le monde.
•
The new manager is a bit of a stuffed shirt, very rigid and formal.
Le nouveau manager est un peu un collet monté, très rigide et formel.