Meaning of “lisp” in the English Dictionary

"lisp" in American English

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lispverb [ I/T ]

us /lɪsp/

to pronounce "s" and "z" sounds like "th," so that "sin" sounds like "thin" and "Zen" sounds like "then"

noun [ C ] us /lɪsp/

I was teased at school because I spoke with a lisp.

(Definition of “lisp” from the Cambridge Academic Content Dictionary © Cambridge University Press)