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The Narmada‐Son lineament is a major tectonic feature in Central India. Here we employ data from geodetic measurements of crustal deformation and upper mantle P‐wave travel time tomography and propose that the Narmada‐Son palaeo‐rift is a present‐day diffuse plate boundary that segments the continental part of the Indian "composite" plate into two component plates, the North and South‐Indian plate. Tomographic images reveal that the collision of an indenter, associated with the relatively faster moving South‐Indian plate, with the Narmada‐Son diffuse plate boundary acted as a pivot point exerting a torque on one of the component plates along with mechanical rotation. This new proposal along with a new identity of the Narmada‐Son diffuse plate boundary is in better agreement with the estimated location of the relative Euler pole across two respective component plates. Our model is also able to better explain the Indian "composite" plate hypothesis, diversity in the topographic architecture along the rift, and contrasting deformation styles on either side of the diffuse plate boundary. [ABSTRACT FROM AUTHOR]