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