At source : অর্থলাভ ইত্যাদির উৎসমূলে;
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Appropriate Prepositions
Careful of (সতর্ক): He is very careful of his fault.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.