Usually means: Extremely ill; very unwell indeed.
Definitions Related words Mentions
We found 11 dictionaries that define the word sick as a dog:

General (8 matching dictionaries)
  1. (as) sick as a dog, sick as a dog: Merriam-Webster
  2. sick as a dog: Oxford Learner's Dictionaries
  3. sick as a dog: Cambridge Advanced Learner's Dictionary
  4. sick as a dog: Wiktionary
  5. Sick as a Dog: Dictionary of Phrase and Fable (1898)
  6. Sick As A Dog: A to Z list of the most popular idioms
  7. Sick as a Dog: The Word Detective
  8. Sick as a dog: World Wide Words

Miscellaneous (2 matching dictionaries)
  1. AbbreviationZ (No longer online)
  2. sick as a dog: Idioms

Slang (1 matching dictionary)
  1. Sick as a dog: Urban Dictionary

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Definitions from Wiktionary (sick as a dog)

▸ adjective:  (simile) Very ill.

Similar:
sick as a cat, sick as a horse, sick as a parrot, dogsick, sickly, sicky, sick, like death warmed over, sick and tired, crazy, more...

Opposite:
healthy, well, fit, hale, robust

▸ Words similar to sick as a dog

▸ Usage examples for sick as a dog

▸ Idioms related to sick as a dog

▸ Wikipedia articles (New!)

▸ Popular nouns described by sick as a dog

▸ Words that often appear near sick as a dog

▸ Rhymes of sick as a dog

▸ Invented words related to sick as a dog

Similar:
sick as a cat, sick as a horse, sick as a parrot, dogsick, sickly, sicky, sick, like death warmed over, sick and tired, crazy, more...

Opposite:
healthy, well, fit, hale, robust



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