lag vs plunge

lag

verb
  • To fail to keep up (the pace), to fall behind. 

  • To respond slowly. 

  • To cause to lag; to slacken. 

  • To cover (for example, pipes) with felt strips or similar material (referring to a time lag effect in thermal transfer). 

adj
  • Late. 

  • Last made; hence, made of refuse; inferior. 

noun
  • A method of deciding which player shall start. Both players simultaneously strike a cue ball from the baulk line to hit the top cushion and rebound down the table; the player whose ball finishes closest to the baulk cushion wins. 

  • A stave of a cask, drum, etc.; especially (engineering) one of the narrow boards or staves forming the covering of a cylindrical object, such as a boiler, or the cylinder of a carding machine or steam engine. 

  • A gap, a delay; an interval created by something not keeping up; a latency. 

  • Delay; latency. 

  • One who lags; that which comes in last. 

  • A bird, the greylag. 

  • The fag-end; the rump; hence, the lowest class. 

  • A prisoner, a criminal. 

plunge

verb
  • To fall or rush headlong into some thing, action, state or condition. 

  • To pitch or throw oneself headlong or violently forward, as a horse does. 

  • To bet heavily and recklessly; to risk large sums in gambling. 

  • To thrust into liquid, or into any penetrable substance; to immerse. 

  • To cast, stab or throw into some thing, state, condition or action. 

  • To remove a blockage by suction. 

  • To dive, leap or rush (into water or some liquid); to submerge oneself. 

noun
  • Heavy and reckless betting in horse racing; hazardous speculation. 

  • A dive, leap, rush, or pitch into (into water). 

  • The act of plunging or submerging. 

  • The act of pitching or throwing oneself headlong or violently forward, like an unruly horse. 

How often have the words lag and plunge occurred in a corpus of books? (source: Google Ngram Viewer )