lockspit

noun

1. A trench dug in the ground to mark a boundary or other imaginary line.

   The widening of the river referred to in items […] was carried out by first cutting a V-shaped trench or lockspit throughout the length of the widenings on the line of the proposed new river bank […].

Where it comes from

Apparently: lock (“fastening”) + spit (“spade's depth”)

Adapted from the Wiktionary entry lockspit (CC BY-SA 4.0).

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