One of the mysteries of the English language finally explained.
A narrow trench dug to mark out a boundary or to indicate lines of work in construction or civil engineering projects.
with object To mark out (a line or boundary) by digging a lockspit or trench.
Mid 17th century; earliest use found in Exemplification St Ives Law Sewers. Apparently from either lock or lock + spit<br>late 17th century. From lockspit.
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