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סָכַל

From LSJ

Ὀργῆς χάριν τὰ κρυπτὰ μὴ ἐκφάνῃς φίλου → Arcana amici ne per iram prodito → Geheimnisse des Freunds verrate nicht im Zorn

Menander, Monostichoi, 418

English (Strong)

for כָּסַל; to be silly: do (make, play the, turn into) fool(-ish, -ishly, -ishness).