Mutual co-operation : পারস্পরিক সহযোগিতা;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
In vogue (চালু): This custom is not in vogue at present.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.