Wavelet : ক্ষুদ্র তরঙ্গ;
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Appropriate Prepositions
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Make up of (গঠিত): Village is made up of many homes.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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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-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.