Hard and fast : বাঁধা-ধরা; অপরিবর্তনীয়ভাবে বিধিবদ্ধ; বাঁধাধরা;
Related Words
hard and fast  hard and fast rules  See Words Also In
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Abide by(মেনে চলা): We must abide by the rules of discipline.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Caution against(সাবধান): Take all cautions against the danger.
Free from (মুক্ত): He is now free from danger.
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Idioms
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Round the clock (সমস্ত দিন): He is working round the clock.
Worthy of (যোগ্য) - He is worthy of a good job.