the process of rankshifting.
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British Dictionary definitions for rankshift
a phenomenon in which a unit at one rank in the grammar has the function of a unit at a lower rank, as for example in the phrase the house on the corner, where the words on the corner shift down from the rank of group to the rank of word
to shift or be shifted from one linguistic rank to another
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012