attenuate vs drain

attenuate

verb
  • To weaken. 

  • To reduce the amplitude of an electrical, radio, or optical signal. 

  • To reduce in size, force, value, amount, or degree. 

  • To become thin or fine; to grow less. 

  • To rarefy. 

  • (of a beer) To become less dense as a result of the conversion of sugar to alcohol. 

  • To reduce the virulence of a bacterium or virus. 

  • To make thinner, as by physically reshaping, starving, or decaying. 

adj
  • Gradually tapering into a petiole-like extension toward the base. 

drain

verb
  • To deplete of energy or resources. 

  • To flow gradually. 

  • To draw off by degrees; to cause to flow gradually out or off; hence, to exhaust. 

  • To convert a perennially wet place into a dry one. 

  • To fall off the bottom of the playfield. 

  • To cause liquid to flow out of. 

  • To lose liquid. 

noun
  • Something consuming resources and providing nothing in return. 

  • One terminal of a field effect transistor (FET). 

  • An access point or conduit for rainwater that drains directly downstream in a (drainage) basin without going through sewers or water treatment in order to prevent or belay floods. 

  • An outhole. 

  • A conduit allowing liquid to flow out of an otherwise contained volume; a plughole (UK) 

  • An act of urination. 

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