Focus on the pronunciation of plug-in
English definition of “plug-in”
plug-in (also plugin)
› IT relating to things that can be added to a computer system to make it work faster or have more features: a plug-in card/keyboard/modem If your PC has no USB ports, you can add them with a plug-in card.
› able to be connected using a plug (= object with metal pins for connecting equipment to an electricity supply): a plug-in electric car/hybrid Alternatively, plug-in timer switches can be bought from hardware stores.