Safety lock : রক্ষাছি্টকিনি;
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Appropriate Prepositions
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Independent of (স্বাধীন): They are independent of my health.
Noted for (বিখ্যাত): She is noted for dancing.
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Idioms
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.