CHEVAL-DE-FRISE n.
nted spikes or spears, five or six feet long, used to defend a passage, stop a breach, or impede the advance of cavalry, etc. Obstructions of chain, boom, and cheval-de-frise. W. Irving.
CLOG n. 2 definitions
That which hinders or impedes motion; hence, an encumbrance, restraint, or impediment, of any kind. All the ancient, honest, juridical principles and institutions of England are so many clogs to check and retard the headlong course of violence and opression. Burke.