At that time : তইখন; তদা; তদানীং;
Related Words
at a time  at home  at that time  at what time  ata time  See Words Also In
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Careful of (সতর্ক): He is very careful of his fault.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.