Wiktionary
vb. To believe that something is very necessary or important.
Usage examples of "set store by".
They set store by your pa because during a starvation time for them he gave them beef cattle.
There was the marble-topped chiffonier--their mother had set store by it, they could not remember why.
And if the gnoles in general set store by their gems, it is nothing at all compared to the senior gnole's emotions about his extra eyes.
Doesn't matter what he does to varmints like squirrels, but some people set store by animals.
A body can take just so much, and I set store by a good cup of coffee.
She smiled, but I'd say it was a might cool, but when she taken my hand to step down she done it like a real lady, and I could see she set store by such things.
After a lifetime of hard work and self-denial, in which pa had few of the things he set store by, he had made one foolish mistake and got hung for it.