Source : Webster's Revised Unabridged Dictionary (1913)

   {Quaking bog}, a bog of forming peat so saturated with water
      that it shakes when trodden upon.

   {Quaking grass}. (Bot.)
   (a) One of several grasses of the genus {Briza}, having
       slender-stalked and pendulous ovate spikelets, which
       quake and rattle in the wind. {Briza maxima} is the large
       quaking grass; {B. media} and {B. minor} are the smaller
       kinds.
   (b) Rattlesnake grass ({Glyceria Canadensis}).