if you stand or fall by something, that thing alone causes you to succeed or fail.
The new television channel will stand or fall by its ability to attract younger viewers.
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stand or fall by (something)
To have one's success or failure dictated by a particular factor. We have always said that this company will stand or fall by the quality of its products.You should diversify your portfolio so your investments don't stand or fall by a small group of stocks.
stand or ˈfall by something
succeed or fail, or be judged good or bad, because of one thing: A salesman stands or falls by the number of sales he makes — if he doesn’t make enough, he loses his job.