per-callesco
callŭi, 3
I.
v. inch. n. and a. *
I.
Neutr., to become very hardened, very callous: civitatis patientia percalluerat, Cic. Mil. 28, 76.—
II.
Act., to get a good knowledge of; in perf., to be well acquainted with, to know well, be well versed in: usum rerum, Cic. de Or. 2, 34, 137; so, disciplinas Stoicas et dialecticas, Gell. 1, 22, 7: leges, id. 20, 1, 20: quinque et viginti gentium linguas, id. 17, 17, 2.