We found 8 dictionaries that define the word down the tubes:

General (5 matching dictionaries)

1. down the tubes: Merriam-Webster
2. down the tubes: Wiktionary
3. down the tubes: Dictionary.com
4. Down The Tubes: A to Z list of the most popular idioms
5. Down the tubes: Phrase Finder

Medicine (1 matching dictionary)

6. down the tubes: Merriam-Webster Medical Dictionary

Miscellaneous (2 matching dictionaries)

7. AbbreviationZ (No longer online)
8. down the tubes: Idioms

Phrases: go down the tubes, goes down the tubes, going down the tubes, gone down the tubes, went down the tubes, more... ▸ Words similar to down the tubes ▸ Usage examples for down the tubes ▸ Idioms related to down the tubes ▸ Wikipedia articles (New!) ▸ Words that often appear near down the tubes ▸ Rhymes of down the tubes ▸ Invented words related to down the tubes