Mutual co-operation : পারস্পরিক সহযোগিতা;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Recover from (সুস্থ হওয়া; পূর্ব অবস্থায় ফিরে আসা): The patient has not yet recovered from his severe illness.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
All in - (পরিশ্রান্ত): I was all in after the meeting.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.