On guard : হাতিয়ার তৈয়ার;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Attacked with(আক্রান্ত): He is attacked with …
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Crying need (জরুরী): Mass education is a crying need for India.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.