吐き気
はきけ · hakike · JLPT N2 · noun
nausea
吐き気 = 吐く (haku, vomit) + 気 (feeling): the feeling of being about to vomit
吐く means to vomit, and 気 means feeling or sense. In this word 気 is read ke, so the word literally means the feeling that you are about to throw up.
吐 — mouth radical 口 + earth 土 (phonetic)
吐 is a phonosemantic compound: 口 (mouth) gives the meaning—an action done with the mouth—while 土 (tǔ) supplies the sound. Originally it meant to spit out or expel from the mouth, and it still covers spitting, vomiting, and by extension uttering or pouring out words.