idiom, expression or a combination of words used in a language in a way which is typical for that particular language
Etimologia (Anglès)
From Middle French idiome, and its source, Late Latin idioma, from Ancient Greek ἰδίωμα (idíōma, “a peculiarity, property, a peculiar phraseology, idiom”), from ἰδιοῦσθαι (idioûsthai, “to make one's own, appropriate to oneself”), from ἴδιος (ídios, “one's own, pertaining to oneself, private, personal, peculiar, separate”).