plug something ↔ in phrasal verb (see also plug)
to connect a piece of electrical equipment to the main supply of electricity, or to another piece of electrical equipment:
‘Is your printer working?’ ‘Wait a minute – it’s not plugged in.’

[TahlilGaran] Dictionary of Contemporary English ▲

I. ˈplug-in¹ adjective [only before noun]
able to be connected to the electricity supply, or to another piece of electrical equipment:
a plug-in microphone

[TahlilGaran] Dictionary of Contemporary English ▲

II. plug-in² , plug‧in /ˈplʌɡɪn/ noun [countable] technical
a piece of computer software that can be used in addition to existing software in order to make particular programs work properly

[TahlilGaran] Dictionary of Contemporary English ▲

plug in
to place a plug into a receptacle
We plugged in the coffee pot before the meeting began.

[TahlilGaran] English Idioms Dictionary ▲

plug in something
to place a plug into a receptacle
We plugged in the coffee pot before the meeting began.

[TahlilGaran] English Idioms Dictionary ▲

plug in
v. phr. To connect (an electrical appliance) to a power wire by putting its plug into a receptacle or hole.
The integrated circuit has multiplied the number of small radios that need not be plugged in.

[TahlilGaran] English Idioms Dictionary ▲