Rarefactions : তনুভবন; বিরলীকরণ;
Related Words
rarefactions  revocations  See Words Also In
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Faith in (বিশ্বাস): I have no faith in him.
Lost in (মগ্ন): Simon is lost in meditation.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Run short (কমতি পড়া) —I ran short of money.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.