invaginate vs mix up

invaginate

verb
  • To turn or fold inwardly. 

  • To fold inward to create a hollow space where none had existed, as with a gastrula forming from a blastula. 

  • To fold up or enclose into a sheath-like or pouch-like structure, either naturally or as part of a surgical procedure. 

adj
  • Having one portion of a hollow organ drawn back within another portion. 

  • sheathed 

mix up

verb
  • To confuse or reverse. 

  • To become involved with, especially socially or romantically. 

  • To prepare something from ingredients that are mixed. 

  • To shuffle. 

  • To combine thoroughly. 

  • To mix or blend thoroughly and completely. 

noun
  • A mix, blend, or variety. 

  • A confusion or reversal. 

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