sick·en 
/ˈsɪkən/ verb
sick·ens; sick·ened; sick·en·ing /ˈsɪkən/ verb 1 somewhat formal : to become sick or to cause (someone) to become sick [no obj] ▪ Many people sickened and died on the long voyage. [+ obj] ▪ The bacteria in the drinking water sickened the whole village. 2 [+ obj] : to cause (someone) to feel disgusted or angry
▪ We were sickened by the reports of violence.
▪ We were sickened by the reports of violence.
be sickening for
Brit, informal : to be starting to have or suffer from (an illness)
▪ I've been sneezing all day. I must be sickening for something.
▪ I've been sneezing all day. I must be sickening for something.
sicken of [phrasal verb]
sicken of (something) US : to lose interest in (something) because you have had too much of it
▪ He soon sickened of [=got sick of] busy city life and moved out to the country.
▪ He soon sickened of [=got sick of] busy city life and moved out to the country.
