the.com/idiom

a sentence that means nothing literally and everything anyway, decoded by no one foreign.

means a fixed expression whose overall meaning can't be worked out from the individual words, peculiar to a particular language or group.

from From Greek idiōma, "a peculiarity, a property of one's own," built on idios, "private, one's own, peculiar" — the same idios that gives us idiot (originally just a private citizen) and idiosyncrasy. It traveled through Latin and French before settling into English around the late 1500s, carrying its core sense intact: an idiom is language that belongs to itself, a phrasing private to one tongue and baffling to all others.

untranslatable
Word-for-word translation produces beautiful nonsense
global cats
Many languages use animals for impossible tasks
raining
English drops cats and dogs, Welsh drops knives
frozen grammar
You cannot say 'spill some beans'
origins lost
Most speakers ignore where phrases came from
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