Upgrade : পদোন্নতি ঘটানো; মেশিন ইত্যাদির উন্নতি ঘটানো;
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
At times (মাঝে মাঝে): He at times comes here.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.