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hotliner

[hot-lahy-ner]
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noun
  1. a person who speaks to callers on a telephone hot line.
  2. Also hot-lin·er. Chiefly Canadian. a radio broadcaster who accepts calls on the air from individuals using a telephone hot line set up for that purpose.
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Origin of hotliner

First recorded in 1970–75; hot line + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018