afternoon tea vs undern

afternoon tea

noun
  • A formal afternoon meal comprising light snacks, accompanied by tea. 

  • A small meal or snack eaten between lunch and dinner (supper); a period of time set aside for this purpose, taken as a break from work or from a conference. 

undern

noun
  • A light meal, particularly in the afternoon. 

  • Synonym of afternoon. 

  • Synonym of evening. 

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