From WordNet (r) 3.0 (2006):
sicken
v 1: cause aversion in; offend the moral sense of; "The
pornographic pictures sickened us" [syn: disgust,
revolt, nauseate, sicken, churn up]
2: get sick; "She fell sick last Friday, and now she is in the
hospital" [syn: sicken, come down]
3: upset and make nauseated; "The smell of the food turned the
pregnant woman's stomach"; "The mold on the food sickened the
diners" [syn: sicken, nauseate, turn one's stomach]
4: make sick or ill; "This kind of food sickens me"