Right angles : সমকোণ;
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Appropriate Prepositions
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
On the wane (হ্রাসমান): His fame is on the wane now.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.