(~s)
1.
A ~ is a device on a piece of electrical equipment into which you can put a bulb or plug.
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2.
A ~ is a device or point in a wall where you can connect electrical equipment to the power supply. (BRIT; in AM, use outlet )
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3.
You can refer to any hollow part or opening in a structure which another part fits into as a ~.
Her eyes were sunk deep into their ~s.
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