At first sight : প্রথম দর্শনে;
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Bad blood - (শত্রুতা): There has always been bad blood between these families.