define chruning poor

I think you might be asking about chronic poor.The answer to your question is already covered in our study material. Follow the given link and scroll down to the topic 'Categorisation of poverty - Chronic poverty' to view the same.

https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/indian-economic-development/unit-iiipoverty/442_2486_6378#slide1_poverty-and-identification-of-poor