tempus fugit [tem-poo s foo-git; English tem-puh s fyoo-jit]
1. times flies.
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Origin: Unknown, but wiktionary (yeah, not likely a credible source) has: Borrowed from Latin, from the verse Georgica which was written by the Roman poet Virgil which is sed fugit interea fugit irreparabile tempus (“but it flees meanwhile: irretrievable time flees”) which has the less literal translation "while, the irreplaceable time escapes".
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