very satisfactory or excellent; everything is fine or working out well.
Origin unknown, but possibly from Yiddish kaput setik, a phrase meaning broken or worthless—which was ironically used to mean the opposite. The word became popular American slang in the 1920s and may have been deliberately twisted from its original meaning.
This is one of those words whose origin is genuinely mysterious—linguists aren't sure where it came from, and it feels like a secret code that 1920s jazz musicians and their friends were using to say 'everything's cool.'
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