Concavity : অবতলতা; খোল; গোলাকার ফাঁপা বস্তুর ভিতর;
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Appropriate Prepositions
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Concerned with(জড়িত): She was concerned with such things.
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.