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resort to biology raises problems

They felt obliged to resort to violence.

Keep some money in the bank to fall back on in case something goes wrong

If the worst comes to the worst, we've got our savings to fall back on.

Once we'd spent all our money, we fall back on our credit card.

We were lucky to have some tinned food to fall back on.

If I won't find a job, I can fall back on my savings.

to use something, especially a form of financial support, when other things have failed: When the business failed, we had to fall back on our savings. / Good to know I have something to fall back on.

When the business failed, we had to fall back on our savings. / Good to know I have something to fall back on.