clear up vs swab

clear up

verb
  • To clean up. 

  • To depart or disappear. 

  • To clarify, to correct a misconception. 

  • To become free of certain blemishes. 

  • Of stormy weather, to dissipate, to become calm. 

  • To pot all of the remaining balls in a single turn. 

swab

verb
  • To use a swab on something, or clean something with a swab. 

noun
  • A sailor; a swabby. 

  • A naval officer's epaulet. 

  • A small piece of soft, absorbent material, such as gauze, used to clean wounds, apply medicine, or take samples of body fluids. Often attached to a stick or wire to aid access. 

  • A mop, especially on a ship. 

  • A piece of material used for cleaning or sampling other items like musical instruments or guns. 

  • A sample taken with a swab (piece of absorbent material). 

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