Answer

In Jain Dharma, when someone says “Dev Guru Krupa”, it means:

“May the grace/blessings of Dev and Guru be with you.”

If a person is asking during Sātam / Atham / Paryushan-related days, you can respectfully reply:

“Dev Guru Krupa.”

or

“Dev Guru ni krupa sada rahe.”

Explanation

In Jain understanding:

• Dev means the Arihant Bhagwan / Tirthankar Bhagwan.
• Guru means true Jain Guru — Sadhu, Sadhvi, Acharya, Upadhyay, who guide the soul toward right conduct.
• Krupa means blessings or compassionate guidance.

So the phrase is used as a respectful, devotional expression.

Takeaway

If someone says or asks “Dev Guru Krupa”, the simple and proper response can be:

“Dev Guru Krupa.”

It is a humble Jain way of remembering Bhagwan and Guru with devotion.