by reason of
US /baɪ ˈriː.zən ʌv/
UK /baɪ ˈriː.zən ʌv/

1.
a causa di, in ragione di
because of; on account of
:
•
The game was canceled by reason of heavy rain.
La partita è stata annullata a causa di forti piogge.
•
He was excused from the meeting by reason of illness.
È stato scusato dalla riunione a causa della malattia.