She had heard rather too often the seven jokes which, under varying guises, made up all of Clif’s humor and philosophy, but she could sit for hours looking amiable while Clif told how clever he was at selling, and she sturdily reminded Martin that they would never have a friend more loyal or generous.
There are no more uses of "guise" in the book.
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Under the guise of friendship he betrayed them.
the text of the Constitution has frequently been rewritten by the Supreme Court in the guise of interpretation.
Law, Pragmatism, and Democracy -- Richard A. Posner