Synonyms of 'idiom'
a group of words which, when used together, have a different meaning from the one suggested by the individual words, eg it was raining cats and dogsProverbs and idioms may become worn with over-use.
the characteristic vocabulary or usage of a person or groupI was irritated by his use of archaic idiom.
a booklet summarising it in plain language
toddlers babbling on in baby talk
The author's style is wonderfully anecdotal.
Certain words may not even be in modern usage.
full of the jargon and slang of self-improvement courses
To use the vernacular of the day, Peter was square.
He is, in common parlance, a `sad loser'.
mode of expression
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in the sense of expression
a particular phrase used conventionally to express somethingHe uses some remarkably coarse expressions.
in the sense of jargon
specialized language relating to a particular subject, profession, or groupfull of the jargon and slang of self-improvement courses
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Thesaurus for idiom from the Collins English Thesaurus