Firsthand : সরাসরি; হাতে-কলমে;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Certain of(নিশ্চিত): Jamal is certain of his success.
Conceal from(লুকানো) Do not conceal anything from me.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Infested with (অতিষ্ঠ): The room is infested with rats.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Out of date (সেকেলে): This fashion is out of date.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.