闸刀开关 zhádāokāiguān knife switch Origin Definitions Defs Strokes Stroke Words Sentences Sents 闸刀 閘刀 zhádāo knife switch A low-voltage power switch used to connect or disconnect an electrical circuit, named for its blade-like component.开关 開關 kāiguān noun switch power switch; mechanical device used to turn electricity, gas, or water on and off