ˈsafety net noun [countable]

1. a large net that is placed below an acrobat who is performing high above the ground, in order to catch them if they fall

2. a system or arrangement that exists to help you if you have serious problems or get into a difficult situation
safety net for
State support should provide a safety net for the very poor.

[TahlilGaran] Dictionary of Contemporary English ▲

a safety net
a system or arrangement that helps you if you have problems, especially financial problems.
The hardship fund provides a safety net for students who run out of money before they've completed their course.
(often + for)

[TahlilGaran] English Idioms Dictionary ▲