Concavity : অবতলতা; খোল; গোলাকার ফাঁপা বস্তুর ভিতর;
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Detrimental to (অপকারী): Smoking is detrimental to health.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Pass away (মারা যাওয়া)— He passed away last night.