expression, suru verb (irregular)
feel nauseous; feel sick
Describes the sensation of nausea or an urge to vomit. Often used with 急に, なんだか, or after describing a cause.
車に酔って吐き気がする。
I feel nauseous from carsickness.
その臭いで急に吐き気がした。
The smell suddenly made me feel sick.