to  go  down the  tube
go
gəʊ
gew
down
daʊn
dawn
the
ðə
dhē
tube
tju:b
tyoob

Definition & Meaning of "go down the tube "in English

to go down the tube
01

to experience a significant decline, failure, or deterioration in a situation, project, or endeavor 

to [go] down the [tube] definition and meaning
Disapproving
Idiom

What is the origin of the idiom "go down the tube" and when to use it?

The idiom "go down the tube" is believed to have originated in the 1930s, when people would throw unwanted items down the sewer pipes. Over time, the phrase came to be used in a figurative sense to describe anything that is going to waste or being ruined.

Examples
The project went down the tube after the funding was cut. 
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