Plug Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
Plug A flat oblong cake of pressed tobacco.
Plug A high, tapering silk hat.
Plug A worthless horse.
Plug A block of wood let into a wall, to afford a hold for nails.
Plug To stop with a plug; to make tight by stopping a hole.
plug an old or over-worked horse
plug and pray plug and pray The Windows 95 equivalent of the Macintosh's plug and play, referring to difficulties encountered when setting up new hardware under Windows 95.
plug away persist in working hard; "Students must plug away at this problem"
Plug Compatible Manufacturer Plug Compatible Manufacturer PCM A manufacturer of equipment that some other manufacturer's system can identify and work with. The PCM's device replaces the original manufacturer's. Most PCMs competed with IBM. PCM devices normally offer a cost-performance benefit over the original device. For example, several PCM versions of the Direct-Access Storage Device IBM 3350 offered twice the storage and improved data access dual port. Plug compatible devices include replacement CPUs, such as the Hitachi 7/90 series which could be substituted for IBM 3090 series processors, I/O subsystems, and dumb terminals like the IBM 3270. [Used outside mainframe market?]