At a time : এককালীন;
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
Cause of(কারণ): Industry is the cause of your success.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
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Idioms
Fair and square (সৎ): The learned persons should be fair and square.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Worthy of (যোগ্য) - He is worthy of a good job.