occallesco

lui, 3
I. v. inch. n. [ob-calleo], to get a thick skin; to grow or become callous.
I. Lit.: latera occallescunt plagis, Plaut. As. 2, 4, 13; Cels. 4, 24. —Poet., of one metamorphosed into a swine: os sensi occallescere rostro, Ov. M. 14, 282.—
II. Trop., to become callous, hardened, insensible: jam prorsus occallui, Cic. Att. 2, 18, 4: longā patientiā occallui, Plin. Ep. 2, 15, 2: sic mores occalluere, Col. 8, 16, 6.
Lewis & Short
A Latin Dictionary, 1879
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