blocktimer
n.— «Greg Sanchez pledged assistance to Cortes, even as he clarified the broadcaster is not a regular employe[e] of the station but a blocktimer, who buys airtime.» —“Task force formed to probe shooting of Cebu broadcaster” by Mars W. Mosqueda Jr. Manila Bulletin (Philippines) June 14, 2003. (source: Double-Tongued Dictionary)
Further reading
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The Merriam-Webster.com dictionary now includes an entry for TL;DR, also rendered as TLDR. It’s a speedy way of dismissing overlong text or introducing a shortened version of something. This useful locution also inspired AI;DR, short for AI;didn’t...