Hard and fast : বাঁধা-ধরা; অপরিবর্তনীয়ভাবে বিধিবদ্ধ; বাঁধাধরা;
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hard and fast  hard and fast rules  See Words Also In
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Identical with (একই ধরণের): You are identical with your sister.
Side with (পক্ষ অবলম্বন করা): The Chairman sided with the powerful party.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.