(sik) adjective
1. Affected with disease; ill; ailing.
2. Of or used by ill persons: often used in combination: sickroom.
3. Affected by nausea; nauseated; desiring to vomit.
4. Expressive or suggestive of nausea; sickly: a sick laugh.
5. Impaired or unsound from any cause; weakened; out of condition.
6. Pallid; wan: said of colors.
7. Depressed and longing because of some unattained desire; languishing: sick for the sea.
8. Disinclined by reason of satiety or disgust; surfeited: with of: sick of music.
9. Exhausted, as soil; unable to produce a profitable yield; also, diseased.
—noun Sick people collectively: with the. [OE sēoc]

(sik) v.t.
1. To seek or attack: used in the imperative to order a dog to attack.
2. To urge to attack: I'll sick the dog on you. Also spelled sic. [Var. of SEEK]