The word darkhaast or darkhast is nothing but a way of saying darkhwaast (Devanagari:दरख़्वास्त,Persian:درخواست) which is Urdu for 'request.' The word was quite commonly used until a few years ago in regular Hindustani literally as well as for written applications. Another word for the same is 'arzi,' which was used in Delhi-6 song 'arziyaan' quite prominently.
Ajay Devgn film Shivaay has a song called darkhaast.
Ajay Devgn film Shivaay has a song called darkhaast.