Definition of safety plug in US English:

safety plug


  • 1A plug or stopper which allows the contents of a container to be quickly and automatically released if the temperature becomes too high or the pressure too great; specifically one made of fusible metal, which melts when the contents become too hot, typically used in a boiler.

  • 2A piece of plastic in the shape of an electrical plug which is used to cover a socket and protect against accidental electrocution (especially of young children).


Early 19th century. From safety + plug.


safety plug

/ˈseɪftɪ plʌɡ/