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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Origin unknown; said to have been thieves’ cant for “lightning”. Also formerly written "giffy", to which a connection with gliff has been proposed. As a kind of envelope, a genericization of Jiffy bag.
blink of an eye, flash, heartbeat, instant, split second, trice, twinkling, wink, New York minute
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Classic usage
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