Safety lock : রক্ষাছি্টকিনি;
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Appropriate Prepositions
Cause of(কারণ): Industry is the cause of your success.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Penalty for, with (দণ্ড, জরিমানা): She has paid the penalty for the misuse of power with two years in prison.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.