Lightning-rod : বাজকাঠি; বজ্রবহ;
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Appropriate Prepositions
Apart from(ছাড়া, ব্যতীত, দূরে): They pave apart from each other.
Averse to (বিমুখ): Rahim was averse of your various problems.
Desist from (বিরত থাকা): She desisted from making this.
Greed for (লোভ): He has an indomitable greed for wealth.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
In vogue (চালু): This custom is not in vogue at present.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.
Well off (স্বচ্ছল) - Jim and Della were not well off.