tide vs undertow

tide

noun
  • Something which changes like the tides of the sea. 

  • Tendency or direction of causes, influences, or events; course; current. 

  • The period of twelve hours. 

  • The periodic change of the sea level, particularly when caused by the gravitational influence of the sun and the moon. 

  • A stream, current or flood. 

verb
  • To pour a tide or flood. 

  • To cause to float with the tide; to drive or carry with the tide or stream. 

  • To work into or out of a river or harbor by drifting with the tide and anchoring when it becomes adverse. 

undertow

noun
  • A short-range flow of water returning seaward from the waves breaking on the shore. 

  • A feeling that runs contrary to one's normal one. 

verb
  • To pull down by, or as by, an undertow. 

  • To flow or behave as an undertow. 

  • To pull or tow under; drag beneath; pull down. 

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