hard-and-fast Meaning in the Cambridge English Dictionary
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Meaning of “hard-and-fast” in the 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/guidelineshard-and-fast evidence/facts/answers With whale ​research, hard and fast facts are difficult to come by. There are no hard-and-fast ​rulesgoverning the ​size of ​companies in the ​portfolio.
(Definition of hard-and-fast from the Cambridge Business English Dictionary © Cambridge University Press)
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