Idioms and Phrases with in cement
Firmly settled or determined; unalterable. For example, Their policy on taxes was set in cement despite opposition. For a synonym, see cast in stone.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.