In Jain usage, “Jin Jin bandhun” is understood as:

“I bow to the Jinas” or “I offer reverence to the victorious souls (Jinas).”

• Jin = the victorious soul, one who has conquered inner passions like anger, pride, deceit, and greed.
• Bandhun / Vandun = to bow, salute, or pay respectful obeisance.

So the भावार्थ is: “I humbly bow again and again to the Jinas and to the enlightened beings who follow their path.”

If you want, I can also explain its Gujarati/Prakrit usage in a simple way.