Rub, n.
  1. The act of rubbing; friction.
  2. That which rubs; that which tends to hinder or obstruct motion or progress; hindrance; obstruction, an impediment; especially, a difficulty or obstruction hard to overcome; a pinch.
     Every rub is smoothed on our way.   --Shak.
     To sleep, perchance to dream; ay, there's the rub.   --Shak.
     Upon this rub, the English ambassadors thought fit to demur.   --Hayward.
     One knows not, certainly, what other rubs might have been ordained for us by a wise Providence.   --W. Besant.
  3. Inequality of surface, as of the ground in the game of bowls; unevenness.
  4. Something grating to the feelings; sarcasm; joke; as, a hard rub.
  5. Imperfection; failing; fault. [Obs.]
  6. A chance. [Obs.]
     Flight shall leave no Greek a rub.   --Chapman.
  7. A stone, commonly flat, used to sharpen cutting tools; a whetstone; -- called also rubstone.
  Rub iron, an iron guard on a wagon body, against which a wheel rubs when cramped too much.
  Rub of the green Golf, anything happening to a ball in motion, such as its being deflected or stopped by any agency outside the match, or by the fore caddie.
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