Quadrangular : চতুর্ভুজাকার;
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Appropriate Prepositions
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Independent of (স্বাধীন): They are independent of my health.
Look after (দেখাশুনা): He looks after me.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.