jumper cables

/JH AH1 M P ER0 K EY0 B AH0 L Z/
noun
  1. 1

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

    He kept a jumper cable in an emergency box in the car, as he had once been caught with a dead battery.

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Source: https://en.wiktionary.org/wiki/jumper%20cable, https://en.wiktionary.org/wiki/jumper%20cables