carve in stone

carve (something) in stone

To make something permanent and incapable of being changed, typically a plan or idea. We might get brunch next weekend, but we haven't carved anything in stone yet.
See also: carve, stone
Farlex Dictionary of Idioms.

carve something in stone

Fig. to fix some idea permanently. No one has carved this one approach in stone; we have several options.
See also: carve, stone
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • carve (something) in stone
  • carved in stone
  • be carved in stone
  • be carved/set in stone
  • set in stone
  • carve
  • in stone, cast/carved/written
  • up in the air
  • any (one) worth (one's) salt
  • seem