Definition of "chance upon" [chance upon]

• To find by chance (verb)

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• "During long periods when it was out of print, Hopcraft's book was the most sought after by customers, a fact which inspires me to buy a copy if I ever chance upon it."
• "By means of this key I crossed it several times with her; but I did not like unexpected meetings, and when Madam de Verdelin was by chance upon our way I left them together without speaking to her, and went on before."