Linchpin : অপরিহার্য উপাদান; অপরিহার্য অংশ; আসল লোক বা জিনিস; গাড়ির চাকার খিল বা পিন;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.