bread and butter vs breadcrumb

bread and butter

noun
  • Used other than figuratively or idiomatically: see bread, butter. 

  • That which is central or fundamental, as to one's business, survival, or income; a staple or cornerstone. 

intj
  • Said when two people walking together are temporarily separated by an obstacle in order to indicate that they belong together. 

breadcrumb

noun
  • A tiny piece of bread, either one that falls from bread as it is cut or eaten, or one made deliberately by crumbling bread. 

  • A single link in a chain indicating the hierarchical location of a directory, web page or similar, used as a navigation aid. 

  • One in a series of clues leading to a person or place. 

verb
  • To add navigational breadcrumbs to (a web page or user interface). 

  • To use clues or enticements to lead someone in the desired direction. 

  • To sprinkle breadcrumbs on to food, normally before cooking. 

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