descend vs plunge

descend

verb
  • To pass from a higher to a lower place; to move downwards; to come or go down in any way, for example by falling, flowing, walking, climbing etc. 

  • To move toward the south, or to the southward. 

  • To fall in pitch; to pass from a higher to a lower tone. 

  • to proceed by generation or by transmission; to happen by inheritance. 

  • To go down upon or along; to pass from a higher to a lower part of 

  • to be derived (from) 

  • To enter mentally; to retire. 

  • To come down, as from a source, original, or stock 

  • To come down to a lower, less fortunate, humbler, less virtuous, or worse, state or rank; to lower or abase oneself 

  • To make an attack, or incursion, as if from a vantage ground; to come suddenly and with violence. 

  • And on the suitors let thy wrath descend. 

  • To pass from the more general or important to the specific or less important matters to be considered. 

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 descend and plunge occurred in a corpus of books? (source: Google Ngram Viewer )