Unfasten : খুলা; বন্ধনমোচন করা; খোলা; আলগা করা; পৃথক করা; আলাদা করে দেওয়া;
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unfasten  unfastened  unification  See Words Also In
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Appropriate Prepositions
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Bar to(বাধা): Poverty is not a bar to happiness.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At times (মাঝে মাঝে): He at times comes here.
Out of order (বিকল): The elevator was out of order.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.