At one time : একদা; এককালে; একবার;
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Appropriate Prepositions
Appetite for(ক্ষুধা): He has no appetite for food.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At home (comfortable— আরাম) He feels at home in Dhaka now.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.