vi 1  :  to pronounce the sibilants s and z imperfectly esp. by giving them the sounds th and  2  :  to speak with a lisp vt  :  to utter with a lisp
, n :  a speech defect or affectation characterized by lisping .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2008.