used to mean actually when you want to say that you think something is very surprising or difficult to believe:
Go down the tubes
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a long cylinder made from plastic, metal, rubber, or glass, especially used for moving or containing liquids or gases:
Go down the tubes meaning & definition 1 of Go down the tubes.
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in biology, any hollow, cylinder-shaped structure in the body that carries air or liquid:
Go down the tubes meaning & definition 2 of Go down the tubes.
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