—I am sure he has an idée fixe, Haines said, pinching his chin thoughtfully with thumb and forefinger.
James Joyce. Ulysses
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She knew well enough what the admonition meant. To Amherst, so long thwarted in his chosen work, the subject of Westmore was becoming an idée fixe; and it was natural that Hanaford should class him as a man of one topic.