Mr. Bumble’s awkwardness was enhanced by the very remarkable expression of the stranger’s eye, which was keen and bright, but shadowed by a scowl of distrust and suspicion, unlike anything he had ever observed before, and repulsive to behold.
There are no more uses of "enhance" in the book.
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This sauce will enhance the flavor of the meat.
The stunning victory over the Blue Devils enhanced the Bulldogs’ image as title contenders.