One of the mysteries of the English language finally explained.
1In full "Ginsu knife". A brand of knife promoted for its durable extra-sharp blade.
2Figurative and in figurative contexts. Something which is efficient at dissecting an argument, cutting through complications, etc.
1970s; earliest use found in The Wisconsin State Journal. Apparently an arbitrary formation designed to look and sound as if it were Japanese, thus evoking associations with the high quality of traditional Japanese blades.
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