buzz up »
To allow entrance into a building from a higher floor by triggering an electronic lock.
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calling card »
A prepaid card or credit card, usually electronically readable, used to pay the charges when making a telephone call.
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jack in »
To insert an electronic coupling into a receptacle; to connect to something, whether involving a physical medium or not.
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on the blink »
Functioning erratically, malfunctioning; not working or not working well. Usually refers to a mechanical or electronic device.
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step down »
To gradually reduce something, a little at a time, as an electronic step down transformer.
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