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English
Etymology
From chock + stone. The climbing sense derives from the wedges' use as artificial chockstones.
2004, Aron Ralston, 127 Hours: Between a Rock and a Hard Place, Simon and Schuster, published 2011, page 68:
In these coldest hours before dawn, from three until six, I take up my knife again and hack at the chockstone. I continue to make minimal but visible progress in the divot.
(climbing) A metal wedge or nut, threaded on a wire, used in rock climbing for protection by wedging it into a crack in the rock.