5. (Building) A block of wood let into a wall, to afford a hold for
nails.
Fire plug, a street hydrant to which hose may be attached. [U. S.] --
Hawse plug (Naut.), a plug to stop a hawse hole. -- Plug and feather.
(Stone Working) See Feather, n., 7. -- Plug centerbit, a centerbit
ending in a small cylinder instead of a point, so as to follow and
enlarge a hole previously made, or to form a counterbore around it. --
Plug rod (Steam Eng.) , a rod attached to the beam for working the
valves, as in the Cornish engine. -- Plug valve (Mech.), a tapering
valve, which turns in a case like the plug of a faucet.
Plug (?), v. t. [imp. & p. p. Plugged (?); p. pr. & vb. n. Plugging
(?).] To stop with a plug; to make tight by stopping a hole.
Plug"ger (?), n. One who, or that which, plugs.
Plug"ging, n. 1. The act of stopping with a plug.