countermove vs flip side

countermove

noun

  • A move in opposition or response to a preceding move. 

verb

  • To move in opposition or in retaliation. 

flip side

noun

  • The reverse, in contrast to the obverse. 

  • The converse; opposite, usually negative, inherent aspects or consequences of something. 

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