noun

• (slang, obsolete) A blow in the face, as in boxing.
  "I made £150 by Alton Locke, and never lost a farthing; and I got, not in spite of, but by the rows, a name and a standing with many a one who would never have heard of me otherwise, and I should have been a stercoraceous mendicant if I had hollowed when I got a facer, while I was winning by the cross, though I didn't mean to fight one."
• (slang, by extension) An unexpected and stunning blow or defeat.
  "“You're such a snob,” she said, with a provoking laugh; coming from the family he was thought to be snobbish about, this was a bit of a facer."
• (slang) A serving of alcoholic drink; a dram.
  "Dory […] poured a little whisky into a glass, and grew reminiscent. “I had a facer myself this morning before I came down,” he said."

noun

• (obsolete) One who faces; one who puts on a false show; a bold-faced person.