At source : অর্থলাভ ইত্যাদির উৎসমূলে;
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Appropriate Prepositions
Burst into(কান্নায় ভেঙ্গে পড়া): He burst into tears.
Convinced of (আশ্বস্ত): You are convinced of his product.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.