On demand : দাবিমাত্র;
Related Words
on demand  on the mat  ondemand  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Competent for(যোগ্য): He is not competent for the post.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Base born (নীচ বংশজাত, খারাপ জাত—adj.) He is a base born person; I cannot go along well with him.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.