éacht1, m. (gs. ~a, pl. ~aí).1. Lit:(a) Killing, slaying; slaughter. Cú mo chéad ~, a dog was the first thing I slew. (b) Slain person; casualty. 2. Feat, exploit; achievement. A chuid ~aí a aithris, to recount his exploits. Is iomaí ~ a rinne sé, many a feat he performed. ~ oibre, prodigious work. Rinne tú ~, it was quite an achievement for you. Rugadh san ~ orthu, they were caught in the act. (Var:~am)