beta
 n.— «BETA: A verbal videotape of how to make a particular climb. Example: “Lay off the arete to a mono, cross through left then match on the slope, rock on the high step, set and dyno for the bucks.”» —“It’s ‘mutants’ against the ‘rock’ at new indoor climbing center” by Rick Ansorge Colorado Springs Gazette Telegraph (Colo.) Feb. 15, 1992. (source: Double-Tongued Dictionary)

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