keep watch vs mount

keep watch

verb
  • To guard; to watch over someone or something. 

mount

verb
  • To get on top of (another) for the purpose of copulation. 

  • To cause to mount; to put on horseback; to furnish with animals for riding. 

  • To attach (a drive or device) to the file system in order to make it available to the operating system. 

  • To attach (an object) to a support, backing, framework etc. 

  • To sit on a combatants torso with the face pointing towards the opponent's head; to assume the mount position in ground grappling. 

  • To increase in quantity or intensity. 

  • To get upon; to ascend; to climb. 

  • To have sexual intercourse with someone. 

  • To begin (a campaign, military assault, etc.); to launch. 

  • To place oneself on (a horse, a bicycle, etc.); to bestride. 

  • To prepare and arrange the scenery, furniture, etc. for use in (a play or production). 

  • To incorporate fat, especially butter, into (a dish, especially a sauce to finish it). 

noun
  • A mounting; an object on which another object is mounted. 

  • An animal, usually a horse, used to ride on (unlike a draught horse). 

  • A hill or mountain. 

  • A car, bicycle, or motorcycle used for racing. 

  • A step or block to assist in mounting a horse. 

  • A signal for mounting a horse. 

  • A dominant ground grappling position, where one combatant sits on the other combatants torso with the face pointing towards the opponent's head. 

  • A green hillock in the base of a shield. 

  • Any of seven fleshy prominences in the palm of the hand, taken to represent the influences of various heavenly bodies. 

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