heads up vs sluggish

heads up

adj
  • Containing only two players. 

intj
  • Used as an informal warning, caution, or call for attention; pay attention! 

sluggish

adj
  • Habitually idle and lazy; slothful; dull; inactive 

  • Having no power to move oneself or itself; inert. 

  • Exhibiting economic decline, inactivity, slow or subnormal growth. 

  • Characteristic of a sluggard; dull; stupid; tame; simple. 

  • Slow; having little motion. 

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