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The definition of a still alarm is an alarm call into a fire station by telephone or any other means than the regular signal and emergency dispatching systems.
An example of a still alarm is a phone call to a fire station to free someone trapped inside a car that's been in an accident.
a fire alarm given by telephone or by any means other than the regular signal device
A fire alarm transmitted silently, as by telephone, rather than by sounding the conventional signal apparatus.