Strong's Definition
a primitive root; to speak in a foreign tongue: -strange language.
STEPBible — Tyndale Abridged Hebrew Lexicon
לָעַז (la.az) — to mumble. (Qal) to speak indistinctly, speak unintelligibly
UBS Dictionary of Biblical Hebrew
verb
Speak | verb qal
to speak a foreign language = action by which humans speak a language that is unknown and therefore not understood
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
[לָעַז] vb. talk indistinctly, unintelligibly;—only Qal ψ 114:1 ref