Bi annual : দ্বিবার্ষিক; ষাণ্মাসিক; দুই বত্সর অন্তর ঘটে এমন; অর্ধ-বার্ষিক;
Related Words
banal  bi annual  biannual  biennial  binominal  See Words Also In
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Look for (খোঁজা): I was looking for the lost phone.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Solution to (সমাধান): None can solution to every problem.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.