Diminishing returns : নিমগ্ন আয়;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.