Please tell me if my understanding is correct.
The meaning of the word "idiomatic" as I have understood it from the way some native speakers have used it while correcting my English is expressing ideas in English in the same way as native speakers do
Am I right?
Yes. Because sometimes native speech does not always match what grammatical rules seem to call for. However, "idiomatic" also refers to figures of speech or shortened ways of speaking that are familiar to native speakers.
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Yes. Because sometimes native speech does not always match what grammatical rules seem to call for. However, "idiomatic" also refers to figures of speech or shortened ways of speaking that are familiar to native speakers.
Your definition is the wrong part of speech, but essentially yes, in one sense of "idiomatic". There is another sense of "idiomatic" which is "having a meaning that can't be deduced from the usual meanings of the individual words".
(Cross-posted.)