One way to hold the word: every community has a way of doing things that its own people never have to think about. Speakers of a language reach for certain wordings without choosing them. Guitarists let their hands fall in certain shapes. Programmers in one language keep reaching for the same few moves. Idiomatic points at that settled house style — the version an insider would produce without effort. It never means correct; correctness is a different test, and something can pass it and still sound foreign.
From the word’s history
From Ancient Greek idíōma, one's own way of speaking, and idiōmatikós, relating to an idiom. The root already carries the idea of something belonging to a particular group and no one else.
來自希臘文 ἰδίωμα（idíōma，「自己的說法」）和 ἰδιωματικός（idiōmatikós，「和 idiom 有關的」）。字根裡就已經有「屬於某群人、別人沒有」的意思，這正是今天各種用法共同的底。
Wiktionary (kaikki extract) idiomatic: 'From Ancient Greek ἰδιωματικός (idiōmatikós, related to an idiom), from ἰδίωμα (idíōma, idiom).' source_ref kaikki:3f6f69a190036ae4:727419131
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