Refractive index : প্রতিসরাঙ্ক;
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Appropriate Prepositions
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Bad at (অদক্ষ): He is not bad at English.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Repent on (নির্ভরশীল): He is repent on his parents.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.