plural idioms
Definition of idiom
1
: an expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements (such as up in the air for "undecided") or in its grammatically atypical use of words (such as give way)
2a
: the language peculiar to a people or to a district, community, or class : dialect
b
: the syntactical, grammatical, or structural form peculiar to a language
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Merriam-Webster unabridged
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Time Traveler for idiom
The first known use of idiom was in 1575
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