Available Definitions:
1) a. - Causing sickness; specif., causing surfeit or disgust; nauseating.
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.