To say the truth, there was much need of professional assistance, not merely for Hester herself, but still more urgently for the child—who, drawing its sustenance from the maternal bosom, seemed to have drank in with it all the turmoil, the anguish and despair, which pervaded the mother’s system.
There are no more uses of "sustenance" in the book.
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The soup kitchen was her only sustenance.
As they grew more affluent, gardeners planted more for beauty than for sustenance.