ライトダウン

noun

lights-out campaign; annual turning off of lights

Refers to an organized event, often annual, where lights are turned off for energy conservation or environmental awareness. Wasei-eigo from English 'light down'.

wasei-eigo (Japanese-coined English), from light down

• 今年ことしのライトダウンは6月がつ21日にちに行おこなわれます。

  This year's lights-out campaign will be held on June 21st.

• ライトダウンに参さん加かして、電でん気きを消けしましょう。

  Let's participate in the lights-out event and turn off the lights.