A primitive root meaning properly, to burn, i.e. (by implication) to be rabid (figuratively, insane); also (from the exhaustion of frenzy) to languish -- faint, mad.
H3856. lahah
[לָהָה] verb languish, faint (= לָאָה) (לְהִי ᵑ7, id.; —
Qal Imperfect3feminine singular with apocope אֶרֶץ וַתֵּ֫לַהּ Genesis 47:13 (of famine).
[לִהְלֵהַּ]
verb quadriliteral amaze, startle (compare Syriac Palpel confudit, obstupefecit; Ethpalpel stupore percussus est; consternatio, all in Lexicons, PS1894) —
Hithpalpel Participle מִתְלַהְלֵהַּ as substantive = madman, followed by זִקִים הַיֹּרֶה Prov Genesis 26:18 (see Now).