LISPS

The habit or an act of lisping.

"He used to have a terrible lisp before going to a speech therapist."

To pronounce the consonant ‘s’ imperfectly; to give ‘s’ and ‘z’ the sounds of ‘th’ (/θ/). This is a speech impediment common among children.

To speak with imperfect articulation; to mispronounce, such as a child learning to talk.

To speak hesitatingly and with a low voice, as if afraid.