I. ˈlisp verb
Etymology: Middle English, from Old English -wlyspian; akin to Old High German lispen to lisp
Date: before 12th century
intransitive verb
1. : to pronounce the sibilants s and z imperfectly especially by turning them into th and th
2. : to speak falteringly, childishly, or with a lisp
transitive verb
: to utter falteringly or with a lisp
• lisp·er noun
II. noun
Date: circa 1625
1. : a speech defect or affectation characterized by lisping
2. : a sound resembling a lisp