come on vs know

come on

verb
  • To encounter, discover; to come upon. 

  • Elaboration of come (in the sense of move towards the speaker or other focus), emphasising motion or progress, or conveying a nuance of familiarity or encouragement. 

  • To be broadcast (through a device), or (of a broadcast) to begin playing. 

  • To appear on a stage or in a performance. 

  • To activate; to turn on. 

  • To enter the playing field. 

  • To show sexual or relational interest through words or sometimes actions. 

  • To progress, to develop. 

  • To get one's period, start menstruating. 

intj
  • An expression of defiance or as a challenge; approach; come at me. 

  • Synonym of let's go, a cheer or expression of support, encouragement, &c. 

  • Come along with me; join me in going. 

  • An expression of disbelief. 

  • An expression of frustration, exasperation, or impatience; hurry up. 

know

verb
  • To be acquainted or familiar with; to have encountered. 

  • To perceive the truth or factuality of; to be certain of or that. 

  • To experience. 

  • To understand or have a grasp of through experience or study. 

  • To be or become aware or cognizant. 

  • To be able to play or perform (a song or other piece of music). 

  • To be aware of; to be cognizant of. 

  • To recognize as the same (as someone or something previously encountered) after an absence or change. 

  • To have knowledge; to have information, be informed. 

noun
  • Knowledge; the state of knowing. 

  • Knowledge; the state of knowing; now confined to the fixed phrase ‘in the know’ 

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