The verbal expression TO DASH SB’S HOPES means to destroy or ruin sb’s hopes:
My hopes of winning the competition were dashed when they changed the rules.
This affair dashed his hopes of being elected president.
I don’t want to dash your hopes, but do you really believe you can win?
Her life was full of dashed hopes.
You can also use other nouns instead of HOPES, like DREAMS or EXPECTATIONS.
She always wanted to become a pop star, but all she has now is dashed dreams of a lawyer.
Our expectations were dashed when he said he couldn’t speak Japanese.
His words dashed my dreams when I was a child and I never became a scientist.
All you have is dashed dreams and expectations.
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