You see I am obliged to economize, in case your prosperity should cease.
Yet these two noble and intelligent creatures, united by the indissoluble ties of maternal and filial love, had succeeded in tacitly understanding one another, and economizing their stores, and Albert had been able to tell his mother without extorting a change of countenance,—"Mother, we have no more money."
There are no more uses of "economize" in the book.
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She adjusted the thermostat as part of an effort to economize.
The school will have to economize, but hopefully without cutting teacher’s salaries.