As he advanced in social experience this uniqueness had acquired a greater value for him, as though he were a collector who had learned to distinguish minor differences of design and quality in some long-coveted object.
There are no more uses of "covet" in the book.
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The company makes knockoffs for people who covet designer fashions, but can’t afford them.
He had discovered a great law of human action, without knowing it - namely, that in order to make a man or a boy covet a thing, it is only necessary to make the thing difficult to obtain.