Dead letter : নির্লক্ষ্য পত্র;
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Appropriate Prepositions
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.