safety stop

noun

Definition of safety stop

:any of various devices to stop an undesirable motion or action: such as
a :an attachment for an elevator to prevent accidental falling
b :a device that closes a supply valve and stops an engine in case of accident to the governor belt
c :a contrivance to prevent a pulley tackle from overhauling
d :a device in a lathe to prevent a carriage from colliding with the headstock
e :a system for stopping trains automatically if they try to pass a stop signal
f :a stop motion for textile machinery

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