Discharge of duty : কর্তব্যপালন; কর্তব্যনির্বাহ;
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Appropriate Prepositions
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Careful of (সতর্ক): He is very careful of his fault.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Run short (কমতি পড়া) —I ran short of money.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.