Linchpin : অপরিহার্য উপাদান; অপরিহার্য অংশ; আসল লোক বা জিনিস; গাড়ির চাকার খিল বা পিন;
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Appropriate Prepositions
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Repent on (নির্ভরশীল): He is repent on his parents.
Similar to (সদৃশ): My T-shirt is similar to yours.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Three score (ষাট): He is happy as his brother got three score.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.