teaspoon vs tsp

teaspoon

verb
  • To serve with a teaspoon 

noun
  • A small spoon used to stir the contents of a cup or glass. 

  • A unit of measure, equivalent to one-third of a tablespoon or roughly five milliliters. 

tsp

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