inflood vs undertow

inflood

verb
  • To flood or flow in; to inflow. 

  • Of a river, water, etc.: to flood or flow into (a place). 

noun
  • The act or process of flooding or flowing in; an inflow or influx. 

undertow

verb
  • To flow or behave as an undertow. 

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

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

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. 

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