Treacherously : বিশ্বাসঘাতকতাপূর্বক;
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Appropriate Prepositions
Appeal to, for(কোন ব্যক্তির কাছে কোন কিছুর জন্য আবেদন করা): The flood affected people appealed to the President for reef.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Hatred for (ঘৃণা): I have no hatred for anyone.
Look at (তাকানো): Students look at the blackboard.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.