Definitions

1. noun

a wall or other obstruction built across a narrow pass or entrance to prevent the enemy from using it

“The defenders constructed a breastwork to block the advancing enemy forces.”

2. noun

a wall or mound of earth, often with a parapet, built to protect troops from enemy fire during siege warfare

“The medieval army built a breastwork to defend their besieged castle.”

3. noun

a low wall or parapet, especially one in a garden or other outdoor setting

“The garden featured a small breastwork along the walking path.”