One enjoyment was certain—that of suitableness of companions; a suitableness which comprehended health and temper to bear inconveniences—cheerfulness to enhance every pleasure—and affection and intelligence, which might supply it among themselves if there were disappointments abroad.
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.