frendo, -is, -ere, fresum (fressum),

v.intr. e tr. I — Tr. — Sent. proprio: 1)Moer, triturar, mastigar (Varr. R. Rust. 2, 4, 17). II — Intr.: 2) Ranger os dentes,e dai: indignar-se (Cic. Tusc.2, 4