From Longman Dictionary of Contemporary Englishpower lineˈpower line noun [countable] TPEa large wire carrying electricity above or under the ground overhead power lines
Examples from the Corpus
power line• They look like jittery, hysterical little birds crowded together on a power line.• From Tempe to east Mesa, 10,000 people lost electricity when high winds toppled a 12,000-volt power line. 