Etymology
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hot-wire (v.)

also hotwire, "bypass the ignition key to start a motor vehicle," 1966, from hot-wire (adj.), which is attested from 1889 in reference to electricity wires. Related: Hot-wired; hot-wiring.

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Definitions of hot-wire

hot-wire (v.)
start (a car engine) without a key by bypassing the ignition interlock;
The woman who lost the car keys had to hot-wire her van
From wordnet.princeton.edu