Undercover : গুপ্তচর; চোরাগোপ্তা; গোপন; গুপ্ত; গুপ্তচরবৃত্তিতে নিযুক্ত;
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Appropriate Prepositions
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Remedy for (প্রতিকার): There is no remedy for cancer.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
With a view to (উদ্দেশ্য): I went to hospital with a view to seeing you.
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Idioms
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.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Set something right (ঠিক করা)— He will set the machine right.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.