This is the 4828th most frequent Japanese word.
消
"消" means "to erase," "to extinguish," or "to disappear."
In this context, '消' is used as a verb ('消す') meaning 'to turn off' or 'to extinguish' an electric appliance such as a light.
電気を消してください。
Please turn off the light.
Here, '消' represents the action of the fire ceasing to burn, and it is used in the intransitive verb form '消える' meaning 'to go out.'
火が消えた。
The fire went out.
In this example, '消' in the verb '消える' is used to mean 'to disappear,' indicating that an item or screen is no longer visible.