shield vs watch

shield

verb
  • To shelter; to protect oneself. 

  • To protect, to defend. 

  • to protect from the influence of 

noun
  • A large expanse of exposed stable Precambrian rock. 

  • A wide and relatively low-profiled volcano, usually composed entirely of lava flows. 

  • Parts at the front and back of a vehicle which are meant to absorb the impact of a collision 

  • A broad piece of defensive armor, held in hand, formerly in general use in war, for the protection of the body. 

  • One who protects or defends. 

  • A spot resembling, or having the form of a shield. 

  • A sign or symbol, usually containing numbers and sometimes letters, identifying a highway route. 

  • A framework used to protect workmen in making an adit under ground, and capable of being pushed along as excavation progresses. 

  • The escutcheon or field on which are placed the bearings in coats of arms. 

  • A field of energy that protects or defends. 

  • In lichens, a hardened cup or disk surrounded by a rim and containing the fructification, or asci. 

  • A police badge. 

watch

verb
  • To attend to dangers to or regarding. 

  • To mind, attend, or guard. 

  • To be wary or cautious of. 

  • To serve the purpose of a watchman by floating properly in its place. 

  • To be vigilant or on one's guard. 

  • To look at, see, or view for a period of time. 

  • To remain awake with a sick or dying person; to maintain a vigil. 

  • To observe over a period of time; to notice or pay attention. 

  • To act as a lookout. 

noun
  • A portable or wearable timepiece. 

  • The act of guarding and observing someone or something. 

  • A period of wakefulness between the two sleeps of a biphasic sleep pattern (the dead sleep or first sleep and morning sleep or second sleep): the first waking. 

  • The post or office of a watchman; also, the place where a watchman is posted, or where a guard is kept. 

  • A particular time period when guarding is kept. 

  • A person or group of people who guard. 

  • A period of time on duty, usually four hours in length; the officers and crew who tend the working of a vessel during the same watch. (FM 55–501). 

  • The act of seeing, or viewing, for a period of time. 

  • A group of sailors and officers aboard a ship or shore station with a common period of duty: starboard watch, port watch. 

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