
Go down the tube/tubes
Figurative Meaning
Used metaphorically for situations that deteriorate, not just physical objects going inside a tube.

His academic performance went down the tubes after he started playing video games.
Colloquial Usage
It's a casual phrase, more suitable for conversations than formal writing.

I heard their project went down the tube - what a bummer!
Negative Connotation
The phrase implies a negative outcome and is often associated with disappointment.

After the lead actor quit, the film production went down the tubes.
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