throw (someone) a lifeline

Translations
бросить (кому-то) спасательный круг
When I was struggling with my finances, my friend threw me a lifeline by lending me some money.
Когда у меня были финансовые трудности, мой друг бросил мне спасательный круг, одолжив немного денег.
Definitions
To provide someone with help or support in a difficult situation, often in a way that offers them a chance to recover or improve their circumstances.