"Hain?" is a complete sentence in itself. Amitabh Bachchan can vouch for it.
Amitabh Bachchan, who is known for his iconic 'hain' in the 1982 film Namak Halaal, from where it gained popularity, is now giving Twitter a lesson on how these two syllables is a full sentence in itself.
Written in Devanagari script, and pronounced as 'hai-en,' the word really conveys a lot more than you would think. Really. Can't hear someone? Can't understand someone? Want a repeat of what they said? 'Hain?'may have a question mark at the end - but it is your answer.
Amitabh Bachchan further explains this in his tweet.
T 3054 - Just look at the efficacy of the Hindi language:(In English)I am sorry, I can not hear you properly, can you please repeat what is the matter ?(In Hindi) हैं......😂~ Ef VB— Amitabh Bachchan (@SrBachchan) January 10, 2019
The tweet has over 30 thousand likes. People's response to his 'Hindi language lesson' proves that they are clearly on-board, and not questioning, 'hain?'
हैं— Ranu (@ranu4040) January 10, 2019
So the next time you want to cut down on your words, you have an easier word to sum it all up.