1. (v. t.) To make sick; to disease.

2. (v. t.) To make qualmish; to nauseate; to disgust; as, to sicken the stomach.

3. (v. t.) To impair; to weaken.

4. (v. i.) To become sick; to fall into disease.

5. (v. i.) To be filled to disgust; to be disgusted or nauseated; to be filled with abhorrence or aversion; to be surfeited or satiated.

6. (v. i.) To become disgusting or tedious.

7. (v. i.) To become weak; to decay; to languish.

OD affect afflict appall be brought down be felled be struck down be traumatized break out catch catch cold collapse come down with contract debilitate degenerate derange deteriorate devitalize disable disgust disimprove disorder enervate enfeeble erupt fail fall back fever get get worse give offense go into shock gross out grow worse horrify hospitalize incapacitate indispose invalid lay up let down nauseate offend overdose put off put out reduce regress relapse reluct repel repulse retrograde retrogress revolt run a temperature shock slacken slip back take take ill turn turn the stomach unhinge unsettle upset weaken worsen