birdlime vs grout

birdlime

verb
  • To add birdlime to. 

noun
  • Time; a jail term, the serving of a prison sentence. 

  • A sticky substance smeared on branches to catch birds. 

grout

noun
  • A thin mortar used to fill the gaps between tiles and cavities in masonry. 

verb
  • To insert mortar between tiles. 

  • To affix with mortar. 

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