On demand : দাবিমাত্র;
Related Words
on demand  on the mat  ondemand  See Words Also In
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Heir to (উত্তরাধিকার পাওয়া): He is an heir to a vast property.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Fair and square (সৎ): The learned persons should be fair and square.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.