Badmouthing : কলঙ্কিত করা; মিথ্যা কলঙ্ক রটান; অপবাদ করা;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Hope for (আশা করা): Let us hope for the best.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.