idiotismus
From LSJ
οὐκ ἔστι γῆρας τοῦδε τοῦ μιάσματος → that pollution never wears out, that pollution can never grow old
Latin > English (Lewis & Short)
ĭdĭōtismus: i, m., = ἰδιωτισμός,
I the common or vulgar manner of speaking, Sen. Contr. 3 praef. § 5; 2, 11 fin.
Latin > French (Gaffiot 2016)
ĭdĭōtismus ou -os, ī, m. (ἰδιωτισμός), expression propre à une langue, idiotisme : Sen. Rhet. Contr. 2, 3, 21.