A structural beam in a bridge or building that can be pulled or raised to create an opening for passage underneath.
From 'draw' (to pull) + 'beam' (Old English beam, meaning a long piece of wood). Common in drawbridge construction since medieval times.
Medieval engineers created drawbeams as one of the first 'automated' security systems—a heavy wooden beam would literally be winched up to block an entrance, combining architecture with mechanical advantage.
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