refrain vs vent

refrain

noun
  • A much repeated comment, complaint, or saying. 

  • The chorus or burden of a song repeated at the end of each verse or stanza. 

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

vent

noun
  • A rant; a long session of expressing verbal frustration. 

  • An opening in a volcano from which lava or gas flows. 

  • Opportunity of escape or passage from confinement or privacy; outlet. 

  • A small aperture. 

  • The opening at the breech of a firearm, through which fire is communicated to the powder of the charge. 

  • Ventriloquism. 

  • A slit in the seam of a garment. 

  • Emission; escape; passage to notice or expression; publication; utterance. 

  • An opening through which gases, especially air, can pass. 

  • The excretory opening of lower orders of vertebrates. 

  • In steam boilers, a sectional area of the passage for gases divided by the length of the same passage in feet. 

verb
  • To allow gases to escape. 

  • To determine the sex of (a chick) by opening up the anal vent or cloaca. 

  • To ventilate; to use a ventilator; to use ventilation. 

  • To express a strong emotion. 

  • To snuff; to breathe or puff out; to snort. 

  • To sell; to vend. 

  • To allow to escape through a vent. 

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