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English definition of “hard-and-fast”

hard-and-fast

adjective (also hard and fast)    
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 adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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