go down the tubes

:  to move on a course :  proceed — compare stop

:  to move out of or away from a place expressed or implied :  leave, depart

:  to take a certain course or follow a certain procedure

:  the act or manner of going

:  the height of fashion :  rage

:  an often unexpected turn of affairs :  occurrence

:  functioning properly :  being in good and ready condition

:  a game played between two players who alternately place black and white stones on a board checkered by 19 vertical lines and 19 horizontal lines in an attempt to enclose the larger area on the board

:  toward or in a lower physical position

:  to a lying or sitting position

:  toward or to the ground, floor, or bottom

:  down (see ¹down) along, around, through, toward, in, into, or on

:  to cause to go or come down (see ¹down) : such as

:  to cause to fall by or as if by shooting :  bring down

:  consume

:  occupying a low position

:  lying on the ground

:  directed or going downward

:  descent, depression

:  an instance of putting down someone (such as an opponent in wrestling)

:  a complete play to advance the ball

:  an undulating usually treeless upland with sparse soil

:  a sheep of any breed originating in the downs of southern England

:  a covering of soft fluffy feathers

:  these feathers

:  something soft and fluffy like down

:  any of various usually cylindrical structures or devices: such as

:  a hollow elongated cylinder

:  one to convey fluids