pin faith on
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pin (one's) faith on (someone or something)
To have expectations or hopes that are dependent on the success, performance, etc., of someone or something. Why are we pinning our faith on him when we know he's not popular enough to defeat the incumbent? I had pinned my faith on the promotion, so I was crushed when I didn't get it.
pin one's faith on someone or somethingand pin one's hopes on someone or something
Fig. to fasten one's faith or hope to someone or something. Don't pin your faith on Tom. He can't always do exactly what you want. He pinned his hopes on being rescued soon.