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seepage pit

American  

noun

  1. a pit that is lined with a porous, mortarless masonry wall in which effluent from a septic tank is collected for gradual seepage into the ground, sometimes used as a substitute for a drainfield.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.