frit vs shaking like a leaf

frit

verb
  • To add frit to a glass or ceramic mixture 

  • To prepare by heat (the materials for making glass); to fuse partially. 

adj
  • Frightened. 

noun
  • A fused mixture of materials used to make glass. 

  • A similar material used in the manufacture of ceramic beads and small ornaments. (eastern Mediterranean; Bronze and Iron Age) 

  • A frit fly. 

shaking like a leaf

How often have the words frit and shaking like a leaf occurred in a corpus of books? (source: Google Ngram Viewer )