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Definition of pin (all) one's hopes on. : to hope very much that (something) will help one or allow one to succeed cancer patients pinning their hopes on a new drug You shouldn't pin all your hopes on getting the job. Word by Word Definitions. Seen and Heard.
The reason is that it is of the nature of hope to desire and expect something apprehended precisely as the good or happiness of the one who hopes ( bonum proprium ). In a qualified sense, however, that is so far as love may have united us with others, we may hope for others as well as for ourselves.