trou de loup

trou-de-loup

[trood-l-oo]
noun, plural trous-de-loup [trood-l-oo] . Military.
a conical or pyramidal pit with a pointed stake fixed vertically in the center, rows of which are dug in front of a fortification to hinder an enemy's approach, formerly used chiefly against cavalry.

Origin:
1780–90; < French: literally, wolf hole

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WordNet
trou-de-loup

noun
a sloping pit with a stake in the middle used as an obstacle to the enemy 
WordNet® 3.0, © 2006 by Princeton University.
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