pin (one's) hopes on (someone or something)

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pin (one's) hopes on (someone or something)

To have expectations that are tied to the success, performance, etc., of a particular person or thing. Why are we pinning our hopes on him when we know he's not popular enough to defeat the incumbent? I had pinned my hopes on this promotion, so I was crushed when I didn't get it.
See also: hope, on, pin

pin one's hopes on

Also, pin one's faith on. Put one's hope or trust in someone or something, as in She'd pinned her hopes on an early acceptance to the college but it didn't materialize. This term, dating from the 1500s, originated as pin one's faith on another's sleeve and may have alluded to the practice of soldiers wearing their leader's insignia on their sleeves. By the 1800s, however, it acquired its present form.
See also: hope, on, pin

ˌpin your ˈfaith/ˈhopes on somebody/something

put your trust in somebody/something; hope for somebody/something: He’s pinning his faith on the revival of the economy.The idea that he’ll be out of prison in five years is all she’s got to pin her hopes on.