Bolt from the blue : বিনা মেঘে বজ্রাঘাত; সম্পূর্ণ অপ্রত্যাশিত জিনিস;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Adept in (দক্ষ): He is adept in playing football.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Set free (মুক্ত করা): The prisoners were set free.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.