WordReference Random House Learner's Dictionary of American English © 2020
ˈcir•cuit ˌbreak•er, n. [countable]
  • Electricitya device for stopping the flow of electricity through an electric circuit:old fuses replaced with circuit breakers.

  • WordReference Random House Unabridged Dictionary of American English © 2020
    circuit break′er, 
    1. ElectricityAlso called  breaker. a device for interrupting an electric circuit to prevent excessive current, as that caused by a short circuit, from damaging the apparatus in the circuit or from causing a fire.
    2. Businessany property-tax relief measure that reduces or limits property taxes for certain eligible taxpayers, as those with low income or the elderly.
    • 1870–75, American.

    Collins Concise English Dictionary © HarperCollins Publishers::
    circuit breaker n
    1. a device that under abnormal conditions, such as a short circuit, interrupts the flow of current in an electrical circuit
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