Trou-de-loup n.; pl. Trous-de-loup Mil. A pit in the form of an inverted cone or pyramid, constructed as an obstacle to the approach of an enemy, and having a pointed stake in the middle. The pits are called also trapholes.
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trou-de-loup
n : a sloping pit with a stake in the middle used as an obstacle
to the enemy
[also: trous-de-loup (pl)]