Noun: trou-de-loup (trous-de-loup)
troo,d'looUsage: archaic- A sloping pit with a stake in the middle used as an obstacle to the enemy
"The defenders dug trous-de-loup around the fortress to impede attackers"
Derived forms: trous-de-loup
Type of: cavity, pit
Encyclopedia: Trou-de-loup