boyau

  1. A small trench or ditch, typically built in a zigzag pattern, serving to connect or provide communication between two trenches, particularly the rear and front lines.
  2. A line, drawn winding about, in order to enclose several tracts of land, or to attack some works.

Pronounced as (IPA)
/ˈbwɑːjəʊ/
Etymology

Borrowed from French boyau. Doublet of bowel.

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