Why goddess kali on god shiva?

As the legend goes, in the battle, Kali was so much involved in the killing spree that she got carried away and began destroying everything in sight. To stop her, Lord Shiva threw himself under her feet. Shocked at this sight, Kali stuck out her tongue in astonishment, and put an end to her homicidal rampage.

Hence the common image of Kali shows her in her mêlée mood, standing with one foot on Shiva's chest, with her enormous tongue stuck out.

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