When warm, light, air crosses mountains it rises into the upper atmosphere and does not fall back to the ground. In this, and other, ways wind changes with the terrain.
Many families had lost their savings during the war and had nothing to fall back on.
If you run out of cash, you can fall back on your savings in the bank.
I've used up my wages, but I have my bank account to fall back on.
They easily fall back on his company.
I have nothing to fall back on.
We must have something to fall back on.
Teachers shouldn't fall back on their authority.
He has no friends to fall back on.
For us, English was the language to fall back on when we couldn't make ourselves understood in French.
In an emergency you can fall back on your savings.
Mr Iuchi has no one to fall back on.
It is always useful to have savings to fall back on.