Optical centre : নেত্রিক কেন্দ্র;
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Appropriate Prepositions
Caution against(সাবধান): Take all cautions against the danger.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
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Idioms
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Pass away (মারা যাওয়া)— He passed away last night.