Available Definitions:
1) v. i. - To pronounce the sibilant letter s imperfectly; to give s and z the sound of th; -- a defect common among children.
2) v. i. - To speak with imperfect articulation; to mispronounce, as a child learning to talk.
3) v. i. - To speak hesitatingly with a low voice, as if afraid.
4) v. t. - To pronounce with a lisp.
5) v. t. - 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) v. t. - To speak with reserve or concealment; to utter timidly or confidentially; as, to lisp treason.
7) n. - The habit or act of lisping. See Lisp , v. i., 1.