(1):

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

(2):

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

(3):

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

(4):

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

(5):

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

(6):

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

(7):

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