just a second vs sit tight

just a second

intj
  • Stop; wait. Used to indicate that the speaker wishes the previous speaker or the proceedings to stop so that he or she can comment on what has been said or has happened so far. 

noun
  • A short period of time, typically anywhere from a few seconds to several minutes or more. 

  • Only one second; a passage of time one-sixtieth of a minute in duration. 

sit tight

verb
  • To wait patiently; to take no action; to remain quiet or relatively motionless. 

How often have the words just a second and sit tight occurred in a corpus of books? (source: Google Ngram Viewer )