Perturbation : ব্যাকুলতা; উদ্বেগ; চাঁচল্য; বিচলন; চঁচলতা; ক্ষোভ; দুশ্চিন্তা;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Caution against(সাবধান): Take all cautions against the danger.
Complain about (কোনো বিষয়ে নালিশ করা): They complained about the mismanagement of the programme.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Dwell in (বাস করা): He dwells in a tall apartment.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Lump sum (এক কালীন) — He gave us lump sum money.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.