What is the meaning of Lock-down?

(n.) A contrivance to fasten logs together in rafting; -- used by lumbermen.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). lock-down. Retrieved September 23, 2026, from http://smartdefine.org/lock-down/definitions/2028572
ChicagoWebster's. 2011. "lock-down" http://smartdefine.org/lock-down/definitions/2028572 (accessed September 23, 2026).
HarvardWebster's 2011, lock-down, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/lock-down/definitions/2028572>.
MLAWebster's. "lock-down" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/lock-down/definitions/2028572>