halt vs observe

halt

verb
  • To be lame, faulty, or defective, as in connection with ideas, or in measure, or in versification. 

  • To bring to a stop. 

  • To limp; move with a limping gait. 

  • To stand in doubt whether to proceed, or what to do; hesitate; be uncertain; linger; delay; mammer. 

  • To falter. 

  • To stop marching. 

  • To stop either temporarily or permanently. 

  • To cause to discontinue. 

  • To waver. 

noun
  • A minor railway station (usually unstaffed) in the United Kingdom. 

  • A cessation, either temporary or permanent. 

observe

verb
  • To comment on something; to make an observation. 

  • To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning). 

  • To notice or view, especially carefully or with attention to detail. 

  • To follow or obey the custom, practice, or rules (especially of a religion). 

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