alighten vs doff

alighten

verb
  • To alight, to dismount or get down from. 

  • To make light; to illuminate or brighten. 

  • To lighten; to reduce in weight or heaviness. 

  • To alight; to land, to descend and rest. 

doff

verb
  • To strip; to divest; to undress. 

  • To get rid of, to throw off. 

  • To remove or take off (something such as clothing). 

  • To remove or tip a hat, as in greeting, salutation or as a mark of respect. 

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