Cotangent : কোণপূরকের স্পর্শরেখা;
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Render into (অনুবাদ করা): Render the passage into Bengap.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Crying need (জরুরী): Mass education is a crying need for India.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.