tirelessly
Vous avez travaillé d'arrache-pied.
You have worked tirelessly.
Tom travaille toujours d'arrache-pied.
Tom is always working his butt off.
Il travaille toujours d'arrache-pied.
He always works tirelessly.
Tout le personnel commercial a travaillé d'arrache-pied durant une semaine.
The entire sales staff worked tirelessly for a week.