This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A device that shuts something off.

n. A stoppage; a cessation.

n. A valve used to turn off something.

n. The act of turning off something.

"Outdoor water efficiency measures employed: smart irrigation control, rain shutoff, soil moisture sensors, climate-compatible landscaping."

shut off   

wsoptournament    defrost    cut-off    by-pass    deckedge    lube    on/off    derichment    hand-operated    perpetual motion