This includes extinguishing or lowering a flame in any way.

As such, it is the opposite of burning.

For example, one may not turn down the gas on a stove or heater on Shabbat. Similarly, it is forbidden to turn off the lights or any other electrical appliance.

The Sabbath, however, may be violated wherever there is any possible danger to human life. So, in case of fire, anything necessary must be done where life may be endangered.