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lisp (v.)

sometimes lipse, late 14c. alteration of wlisp, from late Old English awlyspian "to lisp, to pronounce 's' and 'z' imperfectly," from wlisp (adj.) "lisping," which is probably imitative (compare Middle Dutch, Old High German lispen, Danish læspe, Swedish läspa). General sense "speak imperfectly or childishly" is from 17c. Transitive sense from 1610s. Related: Lisped; lisping. Suggestive of effeminacy from 14c.

lisp (n.)

"act or habit of lisping," 1620s, from lisp (v.).

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Definitions of lisp from WordNet
1
lisp (n.)
a speech defect that involves pronouncing `s' like voiceless `th' and `z' like voiced `th';
lisp (n.)
a flexible procedure-oriented programing language that manipulates symbols in the form of lists;
Synonyms: list-processing language
2
lisp (v.)
speak with a lisp;
From wordnet.princeton.edu