Jackscrew : গুরুভার বস্তু তুলিবার পেঁচালো যন্ত্র;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.