The open seating area in baseball was called the "bleaching boards" as early as 1877. The term "bleachers" used in the sense of benches for spectators can be traced back to at least 1889; named as such because the generally uncovered wooden boards were "bleached by the sun".
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Origin of the word 'Bleachers'
Origin of the word 'Bleachers'
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You can't make bad people harmless by making good people helpless