Old scum : পুরাতন গাদ; পুরানো গাদ;
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Appropriate Prepositions
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Easy of (সরল): The teacher is easy of approach.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.