Naked eye : খালি চক্ষু; খালি চোখ;
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Appropriate Prepositions
Averse to (বিমুখ): Rahim was averse of your various problems.
Caution against(সাবধান): Take all cautions against the danger.
Curse for (অভিশাপ দেয়া): If he ever mistreats my parents, I will certainly curse him for it.
Quick at (চটপটে): A cashier must be quick at figures.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
For good (চিরদিনের জন্য): He left the house for good.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.