lisp

a speech defect that involves pronouncing `s' like voiceless `th' and `z' like voiced `th'

a flexible procedure-oriented programing language that manipulates symbols in the form of lists

The habit or act of lisping. See Lisp, v. i., 1.

speak with a lisp

To pronounce the sibilant letter s imperfectly; to give s and z the sound of th; -- a defect common among children.

To pronounce with a lisp.