mack

Meanings

1. 1
   noun

   (informal) a raincoat (mackintosh); or to flirt aggressively

   He threw on his mack and stepped into the drizzle.

In the 'raincoat' sense, shortened from mackintosh, named after Charles Macintosh, the Scottish inventor of the waterproofing process. The slang verb sense 'to flirt' is of separate, uncertain American origin.

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