set in stone

/ˌset ɪn ˈstəʊn/NEUTRAL · B2

Meaning

fixed and impossible to alter

Examples

  1. 1These are only rough ideas; nothing is set in stone yet.
  2. 2The wedding date isn't set in stone, so we could move it to June.
  3. 3The timetable for next term is set in stone, so the dates can't change now.
  4. 4Don't worry, the menu isn't set in stone; we can still add a vegetarian option.
  5. 5Are the rules of the competition set in stone, or can the judges make exceptions?

Grammar

set is a past participle here and does not change. Usually after be, often in the negative.

Similar in meaning

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