sick

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Related to as sick as a parrot: sick as a dog

sick

1. inclined or likely to vomit
2. 
a. suffering from ill health
b. (as collective noun; preceded by the): the sick
3. 
a. of, relating to, or used by people who are unwell
b. (in combination): sickbed
4. deeply affected with a mental or spiritual feeling akin to physical sickness
5. mentally, psychologically, or spiritually disturbed
6. an informal word for vomit
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
GARY MOORE will not be as sick as a parrot if Cockatoo fails to make a winning return to action in the 2m handicap hurdle at Kempton (4.50) this afternoon, as he thinks the six-year-old will need the race after a layoff of nearly 13 months.
Fortunately, theAmazon Green was not as sick as a parrot despite braving the coldest overnight temperatures of the year.
EMMERDALE'S Joe Gilgun was as sick as a parrot when his pet went missing - and squawking with joy when it turned up!