A lisp is a manner of speaking so that s and other similar consonants are blurred into more of a th- sound. Most little kids have a bit of a lisp when they first start speaking.

If you speak with a lisp, you can also say that you tend to lisp — and if you lisp in a way that makes it hard for people to understand what you're saying, you can visit a speech therapist who will teach you to speak without a lisp. Sometimes dental work — braces, or a mouth that's numb from having cavities filled — can give you a temporary lisp. Lisp comes from the imitative Old English wlisp.

Definitions of lisp
  1. noun
    a speech defect that involves pronouncing `s' like voiceless `th' and `z' like voiced `th'
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    type of:
    defect of speech, speech defect, speech disorder
    a disorder of oral speech
  2. verb
    speak with a lisp
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    type of:
    articulate, enounce, enunciate, pronounce, say, sound out
    speak, pronounce, or utter in a certain way
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