By stander : দর্শক;
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by stander  bystander  bystanders  See Words Also In
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Appropriate Prepositions
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Due to (কারণে): His absence is due to illness.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
Relation with (সম্পর্ক): I have no relation with the culprit.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At a discount (অনাদৃত) Female education is no longer at a discount now.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.