set in stone

US

UK

A2 初級
adj.形容詞一成不變的
The date for the wedding is now set in stone, so we can't change it.
v.t./i.動詞 (及物/不及物)正式確立
The agreement was set in stone after both parties signed the document.
idiom慣用語;成語一成不變
The deadline is set in stone, so there's no possibility of extending it.

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