Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
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Idioms
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
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.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.