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euphonize

American  
[yoo-fuh-nahyz] / ˈyu fəˌnaɪz /
especially British, euphonise

verb (used with object)

euphonized, euphonizing
  1. to make euphonious.


euphonize British  
/ ˈjuːfəˌnaɪz /

verb

  1. to make pleasant to hear; render euphonious

  2. to change (speech sounds) so as to facilitate pronunciation

"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

Etymology

Origin of euphonize

First recorded in 1765–75; euphon(y) + -ize