1 Urban Dictionary is a Web-based dictionary of slang words and phrases. , the site contains over 5.01 million definitions. Submissions are regulated by volunteer editors and rated by site visitors. ( by far my favourite one â click here and check out why)
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.
pin. 1  a small, slender, often pointed piece of wood, metal, etc., used to fasten, support, or attach things. 2  a short, slender piece of wire with a point at one end and a head at the other, for fastening things together. any of various forms of fasteners or ornaments consisting essentially or partly of a pointed or penetrating wire or shaft (often used in combination): a jeweled pin.