plugplugplugs1noun1a thing with metal pins that joins a lamp, machine, etc. to a place in the wall (called a socket) where there is electricity2a round thing that you put in the hole in a bath, to keep the water inplugplugplugspluggedplugging2verb (plugs, plugging, plugged)to fill a hole, so that nothing can get out: He plugged the hole in the pipe with an old rag.plug something into join a lamp, machine, etc. to the electricity, using a plug: Can you plug in the television, please?oppositeunplug