Crash helmets : শিরস্ত্রাণ;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Look into (তদন্ত করা/অনুসন্ধান করা): I am looking into the matter.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
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Idioms
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
For good (চিরদিনের জন্য): He left the house for good.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Three score (ষাট): He is happy as his brother got three score.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.