Explanation

slogan was coined by the Urdu poet, Indian freedom fighter, and leader of the Indian National Congress Maulana Hasrat Mohani in 1921.

It was popularized by Bhagat Singh during the late 1920s 

Inquilab Zindabad is an Urdu phrase, which translates to "Long live the revolution". It was first used by Muhammad Iqbal.

 It was also the official slogan of the Hindustan Socialist Republican Association