sick as a dog

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sick as a dog (not comparable)

  1. (simile) Very ill.
    I caught that new strain of flu and for three days I was as sick as a dog.
    • 1797, John Banks, The Albion Queens, or The Death of Mary, Queen of Scots: A Tragedy, J. Bell, page 32
      Ay, but thou knowest he's as uncertain as the wind; and if, instead of quarrelling with me, he should grow fond, he'd make me as sick as a dog.