pot someone up
 v. phr.— «With the system Bill has engineered, we can hear every word Sid says for four-and-a-half hours, but the listeners can only hear what he’s saying when we choose to “pot him up,” as they say in the radio business.» —“He’s hanging up his microphone” by Rick Armstrong Beacon News (Aurora, Illinois) July 23, 2006. (source: Double-Tongued Dictionary)

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  1. From “potentiometer,” known as a “pot,” which is a type of gradual electronic resistor used on sound boards to control volume.

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