Khub khub anumodhna is a phrase in Jain context.

• anumodhna (अनुमोदना) means assent, approval, or expressed joy/approval.
• khub khub is a strong intensifier meaning “very much” or “greatly.”

So, khub khub anumodhna = “very great/heartfelt approval and rejoicing,” i.e., wholehearted approval or expressively joyful assent.

If you’d like, I can explain how this phrase is used in a specific Jain prayer or hymn.