SICKEN, verb transitive sik'n. 1. To make sick; to disease. Raise this to strength, and sicken that to death. Prior. 2. To make squeamish. It sickens the stomach. 3. To disgust. It sickens one to hear the fawning sycophant. 4. to impair. [Not in use.] SICK'EN, verb intransitive To become sick; to fall into disease.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI