strongly binding; not to be set aside or violated: hard-and-fast rules.
Origin of hard-and-fast
First recorded in 1865–70Related formshard-and-fast·ness, noun
Synonyms for hard-and-fast
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for hard and fastuncompromising
British Dictionary definitions for hard and fast
(hard-and-fast when prenominal) (esp of rules) invariable or strict
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Idioms and Phrases with hard and fast
Defined, fixed, invariable, as in We have hard and fast rules for this procedure. This term originally was applied to a vessel that has come out of water, either by running aground or being put in dry dock, and is therefore unable to move. By the mid-1800s it was being used figuratively.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.