Downward direction : অধোদেশ;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Look for (খোঁজা): I was looking for the lost phone.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Lump sum (এক কালীন) — He gave us lump sum money.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.