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1. Plug into an outlet
   "Please plug in the toaster!"
   - plug into, connect

1. A printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities
   - circuit board, circuit card, board, card, add-in
    
2. An add-on piece of software that extends the features or functionality of a larger application

Derived forms: plugging in, plug-ins, plugs in, plugged in

Type of: enter, infix, insert, introduce, printed circuit

Antonym: unplug

Encyclopedia: Plug in