pillaring
n.— «Caylor said he believes retreat mining, also known as pillaring, or secondary mining, is important because it allows companies to get more coal than they otherwise would.» —“Deadly coal mining method comes under scrutiny” by Roger Alford in Cumberland, Ky. St. Louis Post-Dispatch (Mo.) Sept. 5, 2005. (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...