pinch off vs pucker

pinch off

verb
  • To separate (something) from something else, using a pinching motion. 

pucker

verb
  • To pinch or wrinkle; to squeeze inwardly, to dimple or fold. 

noun
  • A state of perplexity or anxiety; confusion; bother; agitation. 

  • A fold or wrinkle. 

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