Zip vs sardine

Zip

noun
  • A Sicilian or Italian Mafioso who is relatively new to the United States. 

sardine

noun
  • Someone packed or crammed into a small space. 

  • Any one of several species of small herring which are commonly preserved in olive oil or in tins for food, especially the pilchard, or European sardine Sardina pilchardus (syn. Clupea pilchardus). The California sardine Sardinops sagax (syn. Clupea sagax) is similar. The American sardines of the Atlantic coast are mostly the young of the Atlantic herring and of the menhaden. 

verb
  • to fish for sardines 

  • to pack or cram together tightly. 

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