Definition, Meaning & Synonyms

hard-and-fast rule

noun

/hɑrd ənd fæst rul/

Definition

A strict guideline or principle that is unwavering and must be followed.

Examples

In our department, we have a hard-and-fast rule about meeting deadlines; no extensions are allowed.
The teacher emphasized that safety protocols are a hard-and-fast rule that all students must adhere to.
While the policy is generally flexible, there’s one hard-and-fast rule: no phones in class.

Meaning

This phrase refers to rules or regulations that are not flexible and allow for no exceptions. They are definitive and set in stone, providing clear direction.