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trou-de-loup

[trood-l-oo]
noun, plural trous-de-loup [trood-l-oo] /ˌtrud lˈu/. Military.
  1. 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.
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Origin of trou-de-loup

1780–90; < French: literally, wolf hole
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018