Buy pig in a poke : না দেখিয়া কোন দ্রব্য ক্রয় করা;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
On the whole (মোটের ওপর): On the whole, his conduct is good.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.