On demand : দাবিমাত্র;
Related Words
on demand  on the mat  ondemand  See Words Also In
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Concerned with(জড়িত): She was concerned with such things.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.