Definition of "knife-switch" [knife-switch]

• In electricity, a form of switch in which the circuit is closed by the insertion of a metallic strip pivoted, like a knife-blade, between metallic clips or springs. (noun)

The Century Dictionary (Public Domain)

• "Another throw of the knife-switch, and Tawnos yelped."
• ""Because if you don't, I'll have to zap you randomly just to keep up appearances," she said, and threw the knife-switch again."
• "    Another throw of the knife-switch, and Tawnos yelped."