microswitch

noun
mi·​cro·​switch | \ ˈmī-krō-ˌswich How to pronounce microswitch (audio) \

Definition of microswitch

: a very small switch that is sensitive to minute motions and is used especially in automatic devices

First Known Use of microswitch

1940, in the meaning defined above

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The first known use of microswitch was in 1940

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