jumper cable vs tether

jumper cable

noun
  • An electrical cable providing a connection between rail or road vehicles. 

  • A pair of insulated electrical wires with alligator clips at each end used to jump-start a car with a dead (flat) battery. 

tether

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

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

  • 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. 

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