hold lamp

hold lamp

[′hōld ‚lamp]
(electricity)
Indicating lamp which remains lighted while a telephone connection is being held.
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References in periodicals archive ?
Children hold lamps during a protest calling for power in Gaza City.
There was a first Sandown winner for James Reveley in the juvenile hurdle, in which he brought the Tom Tate-trained Flat winner Music Of The Moor from well off the pace to lead at the last, where he blundered, then hold Lamps, who came from even further back.