Who used the word jai Hind at first?

The exact origin of the phrase "Jai Hind" is a bit unclear, but it's generally attributed to Subhas Chandra Bose. He was a prominent Indian nationalist leader who fought for India's independence from British rule.

Here's what we know:

* Bose popularized the phrase: While the origin may be debated, it's undeniable that Bose actively used and promoted "Jai Hind" during his time leading the Forward Bloc and the Indian National Army (INA). He famously used it as a rallying cry during his speeches, encouraging Indians to fight for their freedom.

* "Jai Hind" as a unifying call: The phrase resonated with many Indians due to its simplicity and its message of national unity. It replaced the previously popular "Inquilab Zindabad" ("Long Live the Revolution"), which had a more revolutionary connotation.

* Possible earlier origins: Some sources suggest that the phrase "Jai Hind" might have been in use before Bose popularized it. There are accounts of it being used in the 1920s by other nationalist leaders.

While the specific originator might remain a bit fuzzy, it's undeniable that Subhas Chandra Bose played a crucial role in popularizing and cementing the phrase "Jai Hind" in Indian history and culture.