Of that time : তত্কালীন;
Related Words
of that time  off time  offtime  often times  oftentimes  ofttimes  See Words Also In
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Informed of (অবহিত): I was not informed of your misfortune.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Null and void (বাতিল): The deed has been null and void now.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.