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trou-de-loup

[ trood-l-oo ]
/ ˌtrud lˈu /
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noun, plural trous-de-loup [trood-l-oo]. /ˌtrud lˈu/. 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.
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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. 2021

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