Meaning of “hard-and-fast” in the English Dictionary

american-english dictionary

"hard-and-fast" in American English

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hard-and-fastadjective

/ˈhɑrd·ənˈfæst/

not to be changed:

a hard-and-fast rule

(Definition of “hard-and-fast” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"hard-and-fast" in Business English

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hard-and-fastadjective

also hard and fast uk us

definite and not to be changed, avoided, or ignored:

hard-and-fast deadlines/plans/guidelines
hard-and-fast evidence/facts/answers With whale research, hard and fast facts are difficult to come by.
There are no hard-and-fast rules governing the size of companies in the portfolio.

(Definition of “hard-and-fast” from the Cambridge Business English Dictionary © Cambridge University Press)