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
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Desist from (বিরত থাকা): She desisted from making this.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Crying need (জরুরী): Mass education is a crying need for India.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.