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Adjective: To end in failure. (Related to the expression [down the tubes].) Possible origins: 1. To [pull the chain] on an old fashioned elevated [toilet tank] in order to flush fecal matter from the commode. 2. Flushing something down the toilet so that it ends up in the septic tank. 3. When a prototype ship model design fails hydrodynamic testing in a water-filled tank. 4. Naval aviators who fail to pass the dunker (Helicopter Underwater Escape Training) which is conducted in a large water tank.
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