idiomatic◼◼◼(pertaining or conforming to the mode of expression characteristic of a language) adjective [UK: ˌɪ.dɪə.ˈmæ.tɪk] [US: ˌɪ.diə.ˈmæ.tɪk]English has a lot of idiomatic expressions to offer. = L'anglais est une langue riche en expressions idiomatiques.