set in stone

US /sɛt ɪn stoʊn/
UK /sɛt ɪn stoʊn/
"set in stone" picture
1.

板上钉钉, 不可更改

fixed and unchangeable

:
The decision is not yet set in stone, so we can still make changes.
这个决定还没有板上钉钉,所以我们仍然可以做出改变。
His plans for the future are set in stone.
他对未来的计划已经板上钉钉