At once : অবিলম্বে; এখনই; এইক্ষণেই; তখনই; তইখন; তত্ক্ষণাৎ; এক্ষুণি; সঙ্গে সঙ্গে; তক্ষুণি;
Related Words
at once  atomic  atonce  atonic  autonomic  See Words Also In
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Appropriate Prepositions
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Run on (বিরতিহীন চলা): The bus is running on time.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Bad names (গালমন্দ—n) He called the man bad names.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.