sicken vs come down

sicken and come down both are verbs.

Word	Noun	Adjective	Verb	Adverb
sicken	No	No	Yes	No
come down	No	No	Yes	No

As verbs, sicken and come down are synonyms defined as:

sicken (verb)	come down (verb)
get sick	get sick
make sick or ill	be the essential element
cause aversion in; offend the moral sense of	criticize or reprimand harshly
upset and make nauseated	move downward and lower, but not necessarily all the way
	fall from clouds