2001 - High Country News - I've already lost my alfalfa crop…that's about $20,000 down the tubes.
RELATED IDIOMS :
down and dirty
energetically earthy, direct or sexually explicit - North American informal
down and out
beaten in the struggle of life
completely without resources or means of livelihood
The phrase down and out comes from boxing and refers to a boxer who is knocked out by a blow. Since the early 20th century the noun down-and-out has been used to describe a person without money, a job or a place to live.
down in the mouth
(of a person or their expression) unhappy or dejected – informal
down on your luck
experiencing a period of bad luck – informal
down the road
in the future
later on – informal - chiefly North American
An Australian variant of this phrase is down the track.
down to the ground
totally – informal
1997 - Daily Mail - Sly's better sense of comic timing suits the tongue-in-cheek script down to the ground.
stop work, typically as a form of industrial action - British informal
have someone down as = put someone down as = have something down as = put something down as
judge someone or something to be a particular type or class of person or thing
1914 - M. A. Von Arnim - The Pastor's Wife – The other excursionists were all in pairs. They thought Ingeborg was too and put her down at first as the German gentleman's wife because he did not speak to her.