消灯

1. Origins, structure, and basic meaning

• Structure: 消灯 is read しょうとう and means turning off lights.
• Basic usage: It is used for a dormitory's lights-out time or the state of the lights before leaving.

2. Common pitfalls and similar expressions

• Turning lights on and off
  • 点灯 means turning lights on, while 消灯 means turning them off.
• Time and what is checked
  • In 十一時に消灯する, に marks the time for lights-out.
  • 全ての部屋の消灯を確認する means checking that the lights are off in every room.