To Lisp

1. To pronounce the consonant ‘s’ imperfectly; to give ‘s’ and ‘z’ the sounds of ‘th’ (/θ/, /ð/). This is a speech impediment common among children.
2. To speak with imperfect articulation; to mispronounce, such as a child learning to talk.
3. (archaic) To speak hesitatingly and with a low voice, as if afraid.
4. (archaic) to express by the use of simple, childlike language.
5. (archaic) To speak with reserve or concealment; to utter timidly or confidentially.