append vs tether

append

verb
  • To hang or attach to, as by a string, so that the thing is suspended 

  • To add, as an accessory to the principal thing; to annex 

  • To write more data to the end of a pre-existing file, string, or other object. 

noun
  • An instance of writing more data to the end of an existing file. 

tether

verb
  • to restrict something with a tether. 

  • to connect something to something else. 

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

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) 

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