On demand : দাবিমাত্র;
Related Words
on demand  on the mat  ondemand  See Words Also In
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Die of (রোগে মরা): Many people died of cholera.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
In vogue (চালু): This custom is not in vogue at present.