Cast system : জাতিভেদপ্রথা;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Careful of (সতর্ক): He is very careful of his fault.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
In vogue (চালু): This custom is not in vogue at present.
On the wane (হ্রাসমান): His fame is on the wane now.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.