lisp 
/ˈlɪsp/ noun
/ˈlɪsp/ noun [singular] : a speech problem that causes someone to pronounce the letters “s” and “z” like “th”
▪ He spoke with a lisp.
▪ He spoke with a lisp.
— lisp verb, lisps; lisped; lisp·ing
[no obj] ▪ a child who lisps [+ obj] ▪ He lisped (out) his reply.
[no obj] ▪ a child who lisps [+ obj] ▪ He lisped (out) his reply.
— lisp·er noun, plural lisp·ers [count]
