Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Admit of(স্থান করা, সুযোগপ্রাপ্ত হওয়া): His offence admits of no explanation.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
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Idioms
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.