glean vs think

glean

verb
  • To gather information in small amounts, with implied difficulty, bit by bit. 

  • To collect what is left behind (grain, grapes, etc.) after the main harvest or gathering. 

  • To gather what is left in (a field or vineyard). 

  • To frugally accumulate resources from low-yield contexts. 

noun
  • A collection made by gleaning. 

think

verb
  • To communicate to oneself in one's mind, to try to find a solution to a problem. 

  • To ponder, to go over in one's head. 

  • To guess; to reckon. 

  • To be of opinion (that); to consider, judge, regard, or look upon (something) as. 

  • To presume; to venture. 

  • To seem, to appear. 

  • To conceive of something or someone (usually followed by of; infrequently, by on). 

  • To plan; to be considering; to be of a mind (to do something). 

noun
  • An act of thinking; consideration (of something). 

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