tether vs wishbone

tether

noun
  • a strong rope or line that connects a sailor's safety harness to the boat's jackstay 

  • a rope, cable etc. that holds something in place whilst allowing some movement 

  • the limit of one's abilities, resources etc. 

  • The cardinal number three in an old counting system used in Teesdale and Swaledale. (Variant of tethera) 

verb
  • to connect something to something else. 

  • to connect a cellular smartphone to another personal computer in order to give it access to a hotspot. 

  • to restrict something with a tether. 

wishbone

noun
  • Any sailing vessel rigged with a wishbone. 

  • A suspension component similar in shape to a chicken wishbone. 

  • A particular kind of offensive formation. See wishbone formation. 

  • A forked bone between the neck and breast of a bird consisting chiefly of the two clavicles fused at their median or lower end, regarded as a lucky charm in some countries. 

  • A spar in two parts, between which a sail is hoisted, the wishbone extending its clew. 

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