Extinction angle : কুণ্ঠন কোণ; লোপ-কোণ;
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Appropriate Prepositions
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Caution against(সাবধান): Take all cautions against the danger.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
Base born (নীচ বংশজাত, খারাপ জাত—adj.) He is a base born person; I cannot go along well with him.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
To the point (সঠিক) - The boy answered the question to the point.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.