son devoir
He sacrificed his health to fulfill his duty.
Il a sacrifié sa santé pour accomplir son devoir.
Captain Kirk was only doing his duty.
Le capitaine Kirk ne faisait que son devoir.
— Star Trek II: The Wrath of Khan (1982)
The Colonel has lost sight of his duty as a soldier.
Le colonel a perdu de vue son devoir de soldat.
— Akira (1988)
He should me made to do his duty!
Il devrait être contraint de faire son devoir !
— Moscow Does Not Believe in Tears (1980)
He did his duty at the cost of his health.
Il a fait son devoir au prix de sa santé.
The defendant assaulted a civil servant who was performing his duty.
L'accusé a agressé un fonctionnaire qui était dans l'exercice de ses fonctions.
— Burning (2018)