Disconnect (Method)

disconnect( )
Returns	nil
Description:	Disconnects a function from an event so it is no longer active.
Member of:	Event

Example

Below is an example of connecting a function and then disconnecting it.

local Connection = script.Parent.Touched:connect(function() 
print("Hit")
end)

Connection:disconnect() --the function will no longer print "Hit" when the script's Parent is touched.

There's also a method name Disconnect in CustomEvent.

Disconnect( CustomEventReceiver receiver )
Returns	nil
Description:	Disconnects the receiver from the CustomEvent.
In Object:	CustomEvent