On the sly : গোপনে; গোপনে; চোরাগোপ্তাভাবে;
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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.
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Appropriate to(যোগ্য): His answer is appropriate to the question.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
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Idioms
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 book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Pass away (মারা যাওয়া)— He passed away last night.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.