The twins no longer derive their sustenance from Nature’s founts — in short,’ said Mr. Micawber, in one of his bursts of confidence, ’they are weaned — and Mrs. Micawber is, at present, my travelling companion.
There are no more uses of "sustenance" in the book.
Show samples from other sources
The soup kitchen was her only sustenance.
As they grew more affluent, gardeners planted more for beauty than for sustenance.