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