Cathartic : রেচক; বিশোধক;
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Appropriate Prepositions
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
To the brim (কানায় কানায়) - The river was full to the brim.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.