firebreak

Reader's Digestの定番記事Smart Animalsの２月号から引用します。
My daughter Jenny owned a beautiful German shepherd called Elke. As my wife Sue and I have a holiday house on two hectares of land, we often took Elke along for short breaks so she could exercise in the extra space and enjoy the change of environment. She also liked to be with us and particularly liked to walk us around the firebreaks each day.
"firebreaks" が分からないので辞書を見ます。
・Oxford English Dictionary: An obstacle to the spread of fire, such as a strip of open space in a forest: we passed into a conifer forest and followed firebreaks downhill: a fire-resistant door designed to be a firebreak
・Collins Dictionary: Also: fireguard, fire line. a strip of open land in a forest or on a prairie, to arrest the advance of a fire
・Wiktionary: An area cleared of all flammable material to prevent a fire from spreading across it. The firefighters used a bulldozer to clear a firebreak in the forest to try to contain the forest fire.
なるほど、分かってしまえば覚え易い単語ですね。日本では森林火事は余り発生しないので、引用文の "firebreaks" に対応する言葉は多分防火帯だと思いますが、滅多に見聞きしません。