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Douglas Harper's Etymology Dictionary
punji

sharpened and often poisoned bamboo stake set in a hole as a trap for animals or enemies, 1872, of unknown origin, probably from a Tibeto-Burman language (first recorded in a Bengal context).

Wiktionary
punji

n. A sharpened bamboo stick set in the ground to wound or impale enemy soldiers

Wikipedia

Usage examples of "punji".

I hate to sound stupid like this, but what in the Hell is a punji stake?

On either side of the trail, almost hidden in the grass, scores of punji stakes pointed at the squad.

From that day forward, he never passed a punji stake without seeing it.

Daniel followed Rose through courtyards and houses, and then through a narrow opening in a punji stake fence and a bamboo barricade, a traditional structure designed to protect the villagers from the occasional tiger.

Minniefield had caught his pants leg on one of the punji stakes and yanked his leg quickly away, lest he be scratched by its infection causing point.

But when he made the movement, he pushed his leg into a punji stake behind him.

Minniefield said slowly as he balanced on his good leg amid the punji stakes.

The point man must not fail to see the punji stakes in the tall grass or the trip wire of the boobytrap, yet his eyes and attention must be directed outward, to the treeline, or through the tangled vegetation of the jungle, where armed men could lay in ambush.

He glanced down to clear the ground in front of his feet even though the short grass in the paddies afforded no concealment for punji stakes.

Roth, by the use of booby traps, Molotov cocktails, dynamite, punji pits, C-4, rocks, clubs, bottles, chains, wire, ambushes.

And the deep timber and brush contained deadly swing traps and punji pits.

There were also the ever-present booby traps to take their toll of the American troops, as well as punji stakes and malaria, but very little actual fighting.

Ten more steps, and he reached the edge of a punji pit, which he avoided.

Though he had yet to learn how to save Reggs completely, at least now when the mortars or the grenades or the punji pits took him out, the rifleman died a man.

World as a captain, with some exotic Vietnamese rot carried on a punji stake eating his feet.