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
Abide by(মেনে চলা): We must abide by the rules of discipline.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
Base born (নীচ বংশজাত, খারাপ জাত—adj.) He is a base born person; I cannot go along well with him.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Fair and square (সৎ): The learned persons should be fair and square.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.