headache beam
 n.— «Each set of steel posts holds up another length of steel that spans Weber Street. Warning signs announce the height restriction. If the signs are ignored, trucks that are too tall will hit the steel and, the idea goes, stop before they collide with the formwork. And the name for the trusty crossbar? Engineers call it a “headache beam.”» —“His interest in world affairs never ‘flags’” by Christian Aagaard Kitchener-Waterloo Record (Ontario, Canada) Mar. 29, 1999. (source: Double-Tongued Dictionary)

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