rhotacize

rho·ta·cize

 (rō′tə-sīz′)
tr.v. rho·ta·cized, rho·ta·ciz·ing, rho·ta·ciz·es
1. To cause to undergo rhotacism as part of historical change.
2. To articulate (a sound such as (s) or (z)) as (r).
3. To articulate (a vowel or other speech sound) with characteristics of the sound (r), such as with retroflexion of the tongue or with the center of the tongue raised and back of the tongue concave.

[From Greek rhōtakizein, to make excessive or erroneous use of the letter rho; see rhotacism.]

rho′ta·ci·za′tion (-zā′shən) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

rhotacize

(ˈrəʊtəˌsaɪz) or

rhotacise

vb (tr)
(Linguistics) phonetics to pronounce an r sound excessively or change to an r sound
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014