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A strip of land that has been cleared, plowed, or planted with fire-resistant vegetation to prevent a fire from spreading. Also called fireguard.
1. (Forestry) Also: fireguard or fire line a strip of open land in a forest or on a prairie, to arrest the advance of a fire
2. a measure taken to arrest the advance of anything dangerous or harmful
a strip of plowed or cleared land made to check the spread of a prairie or forest fire.