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powder flag

noun Nautical.
  1. red flag(def 4).
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Origin of powder flag

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for powder flag

Historical Examples

  • A cart went along by my side carrying a red flag; it was a powder-flag.

    Zones of the Spirit

    August Strindberg