Retardment : প্রতিবন্ধক; বাধা; বিলম্ব; গতিহ্রাস;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Look after (দেখাশুনা): He looks after me.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Of course (অবশ্যই): Of course, you know what that meant.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.