Verb

1. To pronounce the sibilant letter ‘s’ imperfectly; to give ‘s’ and ‘z’ the sounds of ‘th’ (/θ / ð/) — a defect common amongst children.
2. To speak with imperfect articulation; to mispronounce, as a child learning to talk.
3. To speak hesitatingly and with a low voice, as if afraid.
4. To pronounce with a lisp.
5. To utter with imperfect articulation; to express with words pronounced imperfectly or indistinctly, as a child speaks; hence, to express by the use of simple, childlike language.
6. To speak with reserve or concealment; to utter timidly or confidentially; as, to lisp treason.