I.to gnash the teeth (poet. and postclass.): “dentibus infrendens gemitu,” Verg. A. 3, 664: “ac simul infrendens,” Stat. Th. 5, 663: “infrendite, inspumate,” Tert. Apol. 12. —
II. To gnash the teeth at, threaten furiously; with dat.: “aliis infrendentem,” Stat. Th. 8, 580.