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sick (v.)

"to chase, set upon" (as in command sick him!), 1845, dialectal variant of seek. Used as an imperative to incite a dog to attack a person or animal; hence "cause to pursue." Related: Sicked; sicking.

sick (adj.)

"unwell," Old English seoc "ill, diseased, feeble, weak; corrupt; sad, troubled, deeply affected," from Proto-Germanic *seuka-, which is of uncertain origin. It is the general Germanic word (compare Old Norse sjukr, Danish syg, Old Saxon siok, Old Frisian siak, Middle Dutch siec, Dutch ziek, Old High German sioh, Gothic siuks "sick, ill"), but in German and Dutch displaced by krank "weak, slim," probably originally with a sense of "twisted, bent" (see crank (n.)).

Restricted meaning "having an inclination to vomit, affected with nausea" is from 1610s; sense of "tired or weary (of something), disgusted from satiety" is from 1590s; phrase sick and tired of is attested from 1783. Meaning "mentally twisted" in modern colloquial use is from 1955, a revival of the word in this sense from 1550s (sense of "spiritually or morally corrupt" was in Old English, which also had seocmod "infirm of mind"); sick joke is from 1958.

sick (n.)

"those who are sick," Old English seoce, from sick (adj.).

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Definitions of sick from WordNet
1
sick (adj.)
having a strong distaste from surfeit;
gossip that makes one sick
sick of it all
sick to death of flattery
Synonyms: disgusted / fed up / sick of / tired of
sick (adj.)
affected by an impairment of normal physical or mental function;
Synonyms: ill
sick (adj.)
feeling nausea; feeling about to vomit;
Synonyms: nauseated / nauseous / queasy / sickish
sick (adj.)
affected with madness or insanity;
Synonyms: brainsick / crazy / demented / disturbed / mad / unbalanced / unhinged
sick (adj.)
(of light) lacking in intensity or brightness; dim or feeble;
Synonyms: pale / pallid / wan
sick (adj.)
deeply affected by a strong feeling;
she was sick with longing
sat completely still, sick with envy
sick (adj.)
shockingly repellent; inspiring horror;
Synonyms: ghastly / grim / grisly / gruesome / macabre
2
sick (v.)
eject the contents of the stomach through the mouth;
Synonyms: vomit / vomit up / purge / cast / cat / be sick / disgorge / regorge / retch / puke / barf / spew / spue / chuck / upchuck / honk / regurgitate / throw up
3
sick (n.)
people who are sick;
they devote their lives to caring for the sick
From wordnet.princeton.edu