Selfpreservation : আত্মারক্ষার সহজাত প্রবৃত্তি; আত্মসংরক্ষণ; আত্মরক্ষা;
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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.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Hatred for (ঘৃণা): I have no hatred for anyone.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.