On the sly : গোপনে; গোপনে; চোরাগোপ্তাভাবে;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Regret for (দুঃখ করা): We regretted for his failure.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.