: designed to be connected to an electric circuit by plugging in
a plug-in toy
a plug-in circuit board
1
: something that plugs in
2
: a small piece of software that supplements a larger program (such as a browser)
plugged in; plugging in; plugs in
: to establish an electric circuit by inserting a plug
: to attach or connect to an electric receptacle (such as an outlet)
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Merriam-Webster unabridged
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