Definitions:

1. A defense obstacle formed from by felling trees toward the enemy and sharpening the branches, used in military fortifications. NOUN
   • As a defense measure, the soldiers erected an abatis of sharpened logs to fortify the perimeter.
2. A line of defense consisting of a barrier of felled or live trees with branches, sharpened or with barbed wire entwined, pointed toward the enemy. NOUN
   • The army relied on a combination of walls and abatis to create a formidable defense against invaders.
3. Refers to a type of field fortification made from trees or branches with sharpened points, usually laid facing outward toward the enemy to slow down or obstruct their advance. NOUN
   • The soldiers built an abatis to strengthen their defensive position and hinder the enemy's approach.

Synonyms:

• abattis
• fence
• goaf
• logjam