FALL BACK ON

Hi everyone

Sorry it took me a while to answer.

Fall back on means to have recourse to save you in case of an emergency.

For instance,

Whenever I can, I save some money from my pay. I think this is wise because I can have something to fall back on in case I lose my job.

or

Josh Brolin, supporting actor for Milk
"Don't do it, become a lawyer; have something to fall back on." —On his father's advice when he became an actor.

http://www.tvguide.com/News/Oscar-Nominees-Quotes-1003093.aspx

See?

See you next time.