warning-pipen. an overflow pipe serving to show when a cistern is too full.
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society > occupation and work > equipment > conveyor > [noun] > conduit, channel, or tube > pipe > to carry off excess liquid > showing when cistern is too full
warning-pipe1833
1833 J. C. LoudonEncycl. Cottage Archit. §1808 To put a half-inch warning-pipe from the cistern to a convenient place near the pump.