Synonyms of 'down the drain'
When someone is gone, they have left the place where you are and are no longer there. When something is gone, it is no longer present or no longer exists.
He's already been gone four hours!
You use lost to refer to a period or state of affairs that existed in the past and no longer exists.
the relics of a lost civilization
Thesaurus for down the drain from the Collins English Thesaurus
If you say that something is going down the drain , you mean that it is being destroyed or wasted.