Right angles : সমকোণ;
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Appropriate Prepositions
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.